Key Change on Pattern Switch

This is driving me insane, and I can’t figure out why it happens. Sometimes it happens sometimes it doesn’t.

Usually my workflow is making a sequence, copy to the next pattern, edit, copy to the next pattern and so on.

A good potion of the time, when I then go back and try to play through my patterns I’ve recorded, the key changes. Why does this happen? I try to make sure I record the first step properly, but it usually doesn’t make a difference.

What in the world am I missing?