I have feedback from one user stating that when a dashboard reloads (either force refresh by the user or when the task runs via the QMC) it changes the user's selections. I've not seen this before, nor can i replicate it.
The dashboard itself is nothing special, it does have a button that applies a bookmark via an action. I believe the issue is where the user has applied the bookmark via the button, the dashboard refreshes and then the selections change.