Welcome to the Community!
First - don't panic! I do not think your issues have been deleted or damaged!
A board is not a container for issues, it displays, and allows you to work with, a set of issues defined by a filter. For JWM projects, the filters are quite simple - they just say "show me everything in project X" to start with.
But, they then go on to drop issues from the display. If an issue is in the last column (meaning "this is done and needs no further action"), and doesn't get updated for a while, the board will drop it. We need something like that, otherwise your board would grow infinitely with a "done" column you actually have no interest in!
It does not change the issue though. It is purely about display. There's no "delete", it's just "meh, it's too old, don't show it"
That is, unless you have a human deleting or moving stuff (or an admin who has set something up to do so)
So, I think the next question is what charts you're trying to get?
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.