PLEASE HELP Error in link Process

I have a process model that opens an interface to "update a request." 

I called the process, passed the parameters and the rule expression to fill the form of the previously entered data which the user is going to update.

when i click edit, the interface shows up , but when i click next or cancel or any other button, it says " Action completed "  and then closed the interface and returns to this page. 

Next or cancel are not the end of the form , next is supposed to take me to the next slide, 

and the button works perfectly on the page that i am calling using the process model. 

"Next" is supposed to take me to the next slide to make the user update the data.