Mic gets activated although the sound is below volume gate

I have set my TS5 Client to Voice Activity Detection. There I use Volume Gate as I use normal speakers and in the other modes TS activates the mic if I watch a video with speech even if it is quiet.

Now if I press my middle mouse button the sound of it activates the mic even though the volume is lower than the volume gate. If I have pressed it multiple times in the past the chance of it causing the activation seems to rise.

I tested it in the sound settings and have attached a screenshot of it happening. There wasn’t a loud sound before the actication, just me pressing the middle mouse button.

I would expect the mic to not activate with sounds below the threshold.