So the conditional that you've set in types works on the forms with my newly created form. hidden link
Not sure why it doesn't work with the manual conditional on the form but you can set the condition in the Types field area and it will work on the form itself.
It is strange that you can't make conditionals in the post form editor when you have the possibility to use conditional groups.
I'm not saying you can't because you can, the issue is i'm not sure why it isn't working on your end.
You should be able to remove the field label by editing the field itself. See Screenshot
Perhaps the issue is unique to your server. You mentioned that your other sites work fine with the conditionals. I'm assuming that they are on a different server from this one.
The other domain was on a diffrent server the first time I tried it. I did a duplicator copy of it and uploaded it to the same server as studentumea.se but now campusloppis.se (both of the domains lay on the same Ip address)
you can check a CRED form out here hidden link
Next I will try to upload the duplicator copy on studentumea.se and see if it works or not.
Given that the issue works fine and is the exact same site I can only assume that its an issue with the server itself not being compatible with the plugin.
Unfortunately seeing that there are no errors being generated I can't give an exact point to say what is the exact issue.