Apple Id photo keeps changing to default stock photo

Hi MsTerriBaby, We appreciate you reaching out to us. We’d like to gather additional details that may help us be in a better position to assist you. Do you have a different Apple device that is signed in to the same Apple ID?

If yes, are you experiencing a similar issue with your other device?

These details can help us in isolating the issue.

In the meantime, let’s test if the issue persists on a newly created user account. 

1. "On your Mac, choose Apple menu > System Settings, then click Users & Groups  in the sidebar. (You may need to scroll down.)
2. Click the Add Account button below the list of users on the right (you may be asked to enter your password.)
3. Click the New Account pop-up menu, then choose a type of user.
4. Enter a full name for the new user. An account name is generated automatically. To use a different account name, enter it now—you can’t change it later.
5. Enter a password for the user, then enter it again to verify. Enter a password hint to help the user remember their password.
6. Click Create User."

You can use the article below as a reference.

Add a user or group on Mac

If you are experiencing the issue when signed in on a different user account, please check if the issue persists while on safe mode.

While on safe mode, please set the Apple ID photo to your preferred one.

Safe mode does a basic check of your startup disk, similar to using First Aid in Disk Utility.

Performing this step may help resolve the issue, or further isolate the issue.

Below is an article to help guide you through the process.

How to use safe mode on your Mac

Take care!