@prosto.duda my initial comment didn’t notice that you are calling the action “Trigger signup from popup_signup/login A”, I thought you were using the “log the user in” or “sign up the user up” action. Please trace out that custom workflow “Trigger signup from popup_signup/login A” till the very end and ensure that that workflow does not have a “go to” action inside of it, because I think that custom workflow is linked to another workflow.
@senecadatabase I think @prosto.duda would be able to explain why he is doing that. I know there are usually different reasons for different UX.