Maybe, just to test this, try to set “Legacy FX” on, try to play with your pattern, then set is off, see if you notice a change.

Another thing : when you play with a Performance pad (or a Scene), it stays stuck if you go to another page (e.g. mutes) until you come back to the Perf (or Scene) page and unlock the pad by hitting it.
When a Perf or Scene is locked like this, the Perf (or Scene) LED is showing a little bit of light…
You know this ?
Have you checked this ?