I cut my wafer away from my incision. I cut the wafer more to one side than the other so I can put the thinner part of the wafer between stoma and incision and cut the remaining so it doesn't overlap.
And yes a similar thing happened to me. Are you getting home care? If so, let them know you have an infection or something similar is starting. If you don't have come care, get to your doctor ASAP.
It definitely sounds like an infection starting and hopefully it will be easy to treat with oral antibiotics. There is also some special stuff they can pack the open wound with that 1. draws the infection out and 2. doesn't hurt like plan gauze does when they change it. It's called silver something (??) and looks like a grey material. sorry I forgot what it is called.