Problem with UniverseGuard

So, i was using UG on my server as an anti-grief plugin, but then i tried switching to another plugin, and now one of the regions seems to be bugged out. To be short - there seems to be still protection, despite the fact that i deleted the plugin. I can’t enter it, i can’t break blocks inside it, i pretty much can’t do anything inside it.
While trying to fix this problem, i tried switching back to UG to remove the region, however it can’t find the region now, despite the fact that i still can’t do anything inside the region.
How much did i screwed myself? Is this fixable?

If you’re sure you’ve removed the UG protection plugin, there should be literally no code preventing you from modifying blocks in that region. Is it actually vanilla Spawn protection, or perhaps caused by the new protection plugin you are using?