Gesture repeat automatically

Hi there,

It worked before - example I use 2 finger spread to create a new tab in either Finder or Firefox etc. or close one.
Before, after the gesture was executed, a new tab opened. Now I have the problem that multiple tabs open or close instead of only one.
This behavior started after setting up two finder turn/twist to increase or decrease the volume.
Would setting could caused that?

Thanks/Danke
Peter