Hi There,
This is very unusual. Would you mind if we do basic troubleshooting first? You could try testing for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
If the issue persists, we need your site URL, wordpress credentials and FTP credentials to check. Provide those on a secure note. We need access on errors logs or check htaccess.