There should be no t7 tiles on the map anymore ... but they are there AND you can not farm them. Seems expired lair tiles, ghost tiles and t7 tiles are not leaving the map. Because of this there is also not so much regeneration of invaders and ghosts on the map because the map is already full.
Everyone that has this problem should report it to Plarium. Go to Menu - Help - Ask a Question - Question type is Loading / Running Issues. You need to give precise information including kingdom and coordinates and you should attach screenshots and / or videos.
With all the unnecessary(?) repeat topics posted of what is effectively the same problem, I am sure that Plarium should already ,ought to be, fully aware of the issue by now.
I agree with you 100% but sometimes everyone thinks that someone else will have reported it.
This seems to be a problem that affects all kingdoms and it has been going on for over a week so if Plarium is aware it must be a difficult problem to fix.
The best place for a problem that effects pretty much everyone for reporting is the forum ... and it is best to make it very clear what is the problem and any "hints" as to what is causing the problem ... and to be as specific as possible ...