It seems whenever i try to import a clan onto the clan competition, that i can't import any large clans. When i try to import my clan, it says import complete after a few seconds, but nothing will appear. I have tried with smaller clans and they work fine, but does anyone else have this problem?

Im having the same issue, been trying to import as well, my clan has a competition that starts tomorrow and I cant seem to get it to work. I have had no issues up until now

As it still isn't working right for me, I just signed up what clanmembers were interested manually. Until it is fixed, you may want to do the same.