Hi Cosmin,
I disabled and uninstalled Jetpack, and it still didn’t work. (After trying this, I reinstalled Jetpack because I want to use their subscription module.) I’ve also tried deactivating all plugins and saw no change.
As far as the horizontal scrolling goes, it is happening because I made the main container’s overflow visible to allow for the slider to extend up underneath the header bar. It’s not an ideal solution, so if you can think of a way to allow for the header to overlap the slider without also creating this horizontal scrolling situation, that would be awesome.
I don’t think the overflow would be affecting the progress bar however.
Any other ideas?