I have a subprocess within a parent process. Once I select the Input Variables

I have a subprocess within a parent process. Once I select the Input Variables on the subprocess and save the node then go back to modify the subprocess node each of the Input Variables have "From form" as the variable and it can't be changed. Does anyone know why the node is doing this? We are on 7.5. If I delete the node and recreate I can change the variables, but once saved it goes back to the same format. I have included a screenshot.
...

OriginalPostID-126707

OriginalPostID-126707