Hello @p3c0 thank you for helping. Unfortunately i did try as you suggested but no luck so far. Mouse wheel is not responding it just wok when i press and drag Don't know what could be the issue. I must check other files of my app maybe something is interfering with this file.
I had an old mouse that gave irratic scroll wheel signals. It still worked but I did notice it jumpy when trying to scoll windows on occasion (all windows, not just Qt). I don't know what you are using but I would make sure the problem is not hardware.