Fix needed: regions get "locked" so that they can't be edited


I'm sorry to make another ticket of the same issue, but this is really bad. I have started to explain the problem and Luis started to solve it, but I really need some advice here now. See the ticket here:
So the problem is that some of the regions are somehow "locked", so that it is not possible to edit the regions, nor of course to delete them. Also these regions are opaque and the background colour is different on the live site. I just tried to make a completely new page of one of those, but the result was that the region I created in About template below the hero image was again locked.
Would it be possible to rush solving this issue! Thanks so much!