@radfaraf and @g.grunert We did an investigation on this issue, and as you said it is all caused by setting the LP MG 24dB filter values below zero.
The only solution to remove the glitches in a similar cases is to avoid the values below zero in this Filter.
We decided to close this issue and mark it as a by design.
I also took the liberty to change the topic title so that people experiencing this issue can find it.