I answer this question quite a bit, so I thought I'd post it in an article that is indexed by Google and maybe that'll help people find this info more easily :)
A common thing people want to do is have a bunch of template checklists that they can reuse over and over.
However, when you add a checklist and "copy items from", the list of checklists includes every instance of every checklist that has ever been created, not just the ones you wanted to use as templates.
The simplest way to resolve this is to put your checklist templates on a card with a name starting with "." so that it always appears at the top of the list:
Iain DooleyCommunity Leader
If you had to thrive a new habit during a lockdown, what would it be? Trello
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events