Why are Sliders not working on my Nopcommerce store??
If not sharing URL, all here may only guess.
Nivo Slider was working fine until I installed LiveChat
So plugin may be the reason. The most probably, adding some styles and scripts and making conflict with another part of the store.
when I deactivate it without uninstalling it, the problem continues
The most probably, cache issue - clear cache would be solution.