Checking completed downloads that were seeding

Why is Tribler checking the completed downloads (99 of them)??
Usually checks the torrents that are in download mode never the torrents fully downloaded and seeding.
Now, this checking will take over an hour and a half to two hours to check 99 files that have been seeding for weeks.
It takes almost a minute to check a 5 gig file; two minutes to check a 15 gig file and 5 minutes to check files over 50 gigs.
I have ten torrents of that size.
What is causing this re-checking files that were seeding instead of checking the torrents that were downloading??

After an hour, tribler crashed trying to check the 99 completed torrents so the seeding could start.