Direct Monitoring - Broken?

Cubase 15 Pro - RME Fireface
Fader set at 0db in cubase (direct monitoring on) pan law: equal power (tried them all) >> TotalMix fader sets to -7.8db. So when recording.. level is low. On playback volume jumps 7.8db!
Direct Monitoring is broken.
Been using this for years and it worked fine.
Help