A bit difficult to explain, but I'll try.
To reproduce: Have a long list (20+ perhaps) in board view and click on a tag at the bottom of that list. The view doesn't go up to the remaining tasks, but have a scrollbar far down the list. In the example images, I clicked the 'accounting' tag on 'Pay DIgital Ocean'. I then have 8 open tasks, but the list was so long before that the filtered tasks no longer are in view. I hope this makes sense! :)