Has anybody found a solution to this? It is really really really annoying!
I think I have narrowed the issue down to the Web Map. All of a sudden this web map got corrupted. If I use a different web map, I don't have this issue. But if I use this web map in any new dashboard, I get the issue above. If I make a copy of the web map and put that in a dashboard, I get the issue. But, an old copy of my dashboard (from several days ago), which uses the "corrupted" web map works fine and does not have this issue.
I have tried different browsers (Firefox and Edge).