Hello,
i would suggest you to follow the following and check if it works??
- Please deactivate all installed 3rd party plugins.
- Delete browsers cache especially cache plugin.
- if any extra codes added by you then remove it.
- Re-save permalinks.
deactivate everything other than wplms defaults then check if it works.
incase it does not work only then:
I would like to request temporary access (wp-admin URL and credentials) in a private reply to your site to take a better look at the issue. The information you will enter is private which means only you and I can see and have access to it.