Mysterium Keyboard Iso [Bug]

[Schwelles]

Hello,

I just build a Mysterium Keyboard from CFTKB and when i try flashing an ISO layout, it becomes weird.

Describe the Bug

Ansi layout works fine so i dont think its the board itself.
When flashing ISO on the board the whole 3rd row moves 1 to the right. So for exampe: the ISO enter is now on delete button, the delete moves to END, PG DN goes to caps lock etc.

I quick fixed it by just moving every key one to the left and it seems to work fine now but it's just very wonky looking.

System Information

• Keyboard: CFTKB Coseyfannitutti Mysterium
  • Revision (if applicable):
• Operating system: Windows 10 Pro ver. 2004
• AVR GCC version:

• ARM GCC version:

• QMK Firmware version:

• Any keyboard related software installed?
  • AutoHotKey
  • Karabiner
  • Other:

Additional Context

I have no clue really what else to do, since I'm not any programming savvy or such so I figured i ask here. Also not sure how to find the AVR or QMK versions on it, i just got the latest QMK toolbox version and for the rest I guess it should be the latest version. Hope I'm in the right Issue list, and thanks for any help.