@kgmitch8
Those sets are not locked. Cooldown timers have blue background, so the timers in your screenshot are not cooldown timers. They indicate that the sets will expire after 138 days. And those timers have been there all the time so it has nothing to do with you putting items into the sets or completing the sets. I don't know why some of the sets are time limited, but they are not locked.
And by the way, your screenshot doesn't show any sets that you have put items into but not completed. It shows that you have completed level 8, 9 and 10 sets and you don't have any items in level 11, 12 and 13 sets.
@EA_Aljo
Do you happen to know why some of the XP sets are time limited? I don't see any reason why those sets should have a time limit in the first place, and it's also strange that some of those sets have a time limit while some of them, such as level 11 as you can see in the screenshot, are permanent.