I can't seem to delete a checklist from cards I copy over to a new board.

[Jennifer]

I am copy cards from a few different boards and all is well except I cannot remove or "tick all items done" on checklists. I've reordered the flows, tried each of these options across several boards and nothing works. 

The card carries over all checklists on it to the new board.

Any help would be appreciated. thanks!