The text file that has accompanied the two most recent Borderlands 3 trainers listing the trainer options and associated keystrokes does not agree with the actual trainer itself.
Starting with Iron Bear - No Iron Bear Weapon Heat every key is off by one. For example:
Option text says trainer says
No Iron Bear Heat separator subtract
Easy Teleport subtract decimal
Unlimited Vehicle Boost decimal divide
Easy Open Golden Chest divide F1
and so on down the list.
It's not, your saved hotkeys are one just one key off. So either reset your hotkeys in the trainer or use the "open notes in external editor" in the trainer to open a readme that matches with your current hotkeys.