[Plugin: WP User Frontend] Setting changes without any effect….

Hi! Changing of some settings doesn’t work. The settings are the following:
1) the ‘default post category’ option list doesn’t show all the categories I have…
2) if I select ‘No’ in the ‘allow post tags’ option, it doesn’t have any effect and the plugin still shows the tags to the user…

Furthermore, I’d like to eliminate some labels like the title and the asterisks. is it possible?

Last but not least problem is that even if I’ve saved the setting changes, when I click another time to go to the plugin settings, almost every option is as default.

I’ve tried to uninstall and install again (or deactivate and reactivate) the plugin but there are still the same problems….

thank you for your help!

https://www.ads-software.com/extend/plugins/wp-user-frontend/