I have observed the same behavior on my MacBook (macOS 12.4) with dt 3.8.1 using the trackpad. If while depressing the trackpad with one finger (left click hold) and sliding a slider, I cross the halfway mark between sliders above or below the input will change to the adjacent slider. Dragging a single finger to move the pointer and clicking with a single finger works fine in dt otherwise. This does not occur using a mouse. MStratten has told me gtk and macOS have fundamental incompatibilities so not push for a fix, I just use the mouse. This is just another data point, I don’t know details of how the trackpad actions appear to gtk. Just started using dt and very impressed with the approach.