I just moved your question to the appropriate forum
You probably have this resolved by now...
But if not - have you published the resolve window associated to the action to Web Desk?
That is a slightly bespoke resolution part of the process as it appears to be using a windowless action Resolve Incident and then an automatic Resolve. So I'd look at the window rules for that specific action. Not the standard action Resolve, but the customised Resolve Incident you have. If window rule that controls popping this window isn't quite right, you might see this behaviour. It will be popping an Incident window, not a resolution window if I'm right.