Hi,
I don't see any problem with these settings. Also, On my end the carousel on your page works fine, even when trying on different computers/browsers.
Maybe there is a javascript conflict with another extension and that it only happens in some cases.... Maybe it's a jquery conflict (the most probable when there is a javascript conflict)... and maybe in that case, the extension jQuery Easy might help.
That's a lot of maybe, but unfortunately, I can't troubleshoot something where I don't see any problem.