Salesforce Profile Object Permissions Reset Automatically Due to View All Data or Modify All Data Settings

The automatic assignment of object permissions is caused by the "View All Data" and "Modify All Data" permissions in the Administrative Permissions section of each Profile. When either permission is enabled, Salesforce overrides all individual object-level permissions and automatically grants full Create, Read, Edit, and Delete access to every object in the org.
To resolve this, disable both "View All Data" and "Modify All Data" permissions in the Administrative Permissions section of the affected Profile. The steps below cover both interface options and both Salesforce experiences.

Option 1: Using the Original Profile Interface

Classic Interface

1. Go to Setup > Manage Users > Profiles.
2. Select the Profile you need to edit.
3. Click Edit.
4. In the Administrative Permissions section, confirm that View All Data and Modify All Data are disabled (unchecked).
5. Click Save.

Lightning Experience

1. Go to Setup > Users > Profiles.
2. Select the Profile you need to edit.
3. Click Edit.
4. In the Administrative Permissions section, confirm that View All Data and Modify All Data are disabled (unchecked).
5. Click Save.

Option 2: Using the Enhanced Profile Interface

Classic Interface

1. Go to Setup > Manage Users > Profiles.
2. Select the Profile you need to edit.
3. Click System Permissions.
4. Click Edit.
5. Confirm that View All Data and Modify All Data are disabled (unchecked).
6. Click Save.

Lightning Experience

1. Go to Setup > Users > Profiles.
2. Select the Profile you need to edit.
3. Click System Permissions.
4. Click Edit.
5. Confirm that View All Data and Modify All Data are disabled (unchecked).
6. Click Save.