diff --git a/frontend/src/components/forms/ExpenseForm/index.jsx b/frontend/src/components/forms/ExpenseForm/index.jsx
index ffb2f00c..040ad8d9 100644
--- a/frontend/src/components/forms/ExpenseForm/index.jsx
+++ b/frontend/src/components/forms/ExpenseForm/index.jsx
@@ -41,7 +41,7 @@ export default function ExpenseForm({ groupData: group }) {
   const handleExpenseSubmit = useCallback(
     async e => {
       e.preventDefault();
-
+      if (isSubmitting) return;
       if (!distributionOK) {
         return customToast(
           'Erro',
@@ -92,7 +92,7 @@ export default function ExpenseForm({ groupData: group }) {
         setIsSubmitting(false);
       }
     },
-    [amount, divisionAmount, distributionOK]
+    [amount, divisionAmount, distributionOK, isSubmitting]
   );
 
   const removeMember = memberId => {
@@ -169,16 +169,12 @@ export default function ExpenseForm({ groupData: group }) {
         )}
 
         {/* Botão de envio */}
-        <div className="col-span-2 mt-4">
+        <div className="col-span-2 mt-4 w-full flex justify-end">
           <ButtonUI
             type="submit"
             disabled={isSubmitting || !distributionOK || amount <= 0}
             aria-disabled={isSubmitting || !distributionOK || amount <= 0}
-            className={`bg-primary hover:bg-secondary text-white py-3 px-6 rounded w-full sm:w-auto font-semibold transition ${
-              isSubmitting || !distributionOK || amount <= 0
-                ? 'opacity-50 bg-gray-400! cursor-not-allowed!'
-                : 'cursor-pointer'
-            }`}
+            className={`bg-primary hover:bg-secondary text-white cursor-pointer disabled:bg-muted/20 disabled:cursor-not-allowed  py-3 px-6 rounded w-full sm:w-auto font-semibold transition`}
           >
             {isSubmitting ? 'Enviando...' : 'Adicionar Despesa'}
           </ButtonUI>
diff --git a/frontend/src/components/forms/GroupForm.jsx b/frontend/src/components/forms/GroupForm.jsx
index 189e8f6b..b2df0724 100644
--- a/frontend/src/components/forms/GroupForm.jsx
+++ b/frontend/src/components/forms/GroupForm.jsx
@@ -1,4 +1,4 @@
-import { useState } from 'react';
+import { useCallback, useState } from 'react';
 import { useMutation, useQueryClient } from '@tanstack/react-query';
 import InputUI from '../ui/Input';
 import ButtonUI from '../ui/Button';
@@ -46,15 +46,18 @@ export default function GroupForm({ page }) {
   const IconComponent = entry.icon;
   const iconColor = entry.color;
 
-  const handleSubmit = async e => {
-    e.preventDefault();
-
-    mutateAsync({
-      name: groupName,
-      description,
-      icon: selectedIcon,
-    });
-  };
+  const handleSubmit = useCallback(
+    async e => {
+      e.preventDefault();
+      if (isPending || isDisabled) return;
+      mutateAsync({
+        name: groupName,
+        description,
+        icon: selectedIcon,
+      });
+    },
+    [isPending, isDisabled]
+  );
 
   return (
     <Form
diff --git a/frontend/src/hooks/ReactQuery/Mutations/useDeleteGroupMemberMutation.js b/frontend/src/hooks/ReactQuery/Mutations/useDeleteGroupMemberMutation.js
index 252dec8e..a33a0d80 100644
--- a/frontend/src/hooks/ReactQuery/Mutations/useDeleteGroupMemberMutation.js
+++ b/frontend/src/hooks/ReactQuery/Mutations/useDeleteGroupMemberMutation.js
@@ -23,10 +23,11 @@ export function useDeleteGroupMemberMutation(groupID, page, search) {
       });
       customToast('Membro removido', 'Membro removido com sucesso.', 'success');
     },
-    onError: () => {
+    onError: error => {
       customToast(
         'Erro ao excluir o membro do grupo',
-        'Não foi possível excluir o membro do grupo. Tente novamente.',
+        error.response?.data?.message ||
+          'Não foi possível excluir o membro do grupo. Tente novamente.',
         'error'
       );
     },
diff --git a/frontend/src/pages/Groups/GroupDetails/AddMember.jsx b/frontend/src/pages/Groups/GroupDetails/AddMember.jsx
index 3069ca3e..a3a4441b 100644
--- a/frontend/src/pages/Groups/GroupDetails/AddMember.jsx
+++ b/frontend/src/pages/Groups/GroupDetails/AddMember.jsx
@@ -75,7 +75,7 @@ export default function AddMemberForm({ onSubmit, onCancel }) {
           <ButtonUI
             type="button"
             onClick={onCancel}
-            className="px-6 py-2 rounded-lg font-semibold shadow-md bg-muted text-white hover:bg-muted/80 transition"
+            className="px-6 py-2 cursor-pointer rounded-lg font-semibold shadow-md bg-muted text-white hover:bg-muted/80 transition"
           >
             Cancelar
           </ButtonUI>
@@ -83,11 +83,8 @@ export default function AddMemberForm({ onSubmit, onCancel }) {
         <ButtonUI
           type="submit"
           disabled={isSubmitDisabled}
-          className={`px-6 py-2 rounded-lg font-semibold shadow-md text-white transition ${
-            isSubmitDisabled
-              ? 'bg-primary/60 cursor-not-allowed opacity-70'
-              : 'bg-primary hover:bg-primary/90 active:bg-primary-dark'
-          }`}
+          className={`px-6 py-2 disabled:bg-muted/20 disabled:cursor-not-allowed cursor-pointer rounded-lg font-semibold shadow-md text-white transition bg-primary hover:bg-primary/90 active:bg-primary-dark 
+           `}
         >
           {isSubmitting ? 'Adicionando...' : 'Adicionar'}
         </ButtonUI>