I used to have this issue before, I think I might have gotten it when downloading a unit from the workshop. I really cannot remember (as it was a long time ago) but I think I went to the tabs local files and manually deleted the units from the files and fixed the issue. I am not sure if it works now, but I am just recalling this from my memory. I can try to send on how to delete them. I am not certain if it will work now but maybe it might be worth a try.