Touching Midi Fader switches recording

[Seeya1]

I got a weird problem.
When I have got more than one midi track and record to for example Track 1, every time I touch an other Midi Track, the recording switches to the other track. Quite disturbing if you just want to change the volume of track two while recording track one and at the moment you touch feeder 2 it erases you midi notes on tracks two. I can´t find anyplace where I can activate or deactivate this feature (looked up manuals …). This have never been before …
Does anybody know how to turn this off ??
PT HD 11.1.1

Even if I record safe track two and touch it track one stops recording. The only good thing track two isn't erased any more … But I can´t work like this … No touching while recording a midi track (