Sliders in develop module of Lightroom drop to most negative value when I click and drag on them

Whenever I click on any slider in the Develop module of Lightroom Classic, the slider value automatically drops to the most negative value in the range (i.e. it goes to the far left of the slider range). For example, Exposure drops to -5.0, Contrast, Highlights, Whites, Blacks etc drop to -100. The mouse pointer stays where it is (i.e. it doesn’t follow the slider handle). If I then drag the mouse pointer to the right, the slider value follows some distance behind it. It is making Lightroom totally unuseable.

I have a mac mini m4, Lightroom version 15.6. The bug started after I updated to this version a few days ago.