mouseover on mobile not working

[marcikola]

marcikola.com
safari, chrome, firefox on iOS

hi! the mouseover for video thumbnails seems to not work on mobile.

i set thumbnail settings "Behaviour on Mobile Devices" to "Always show mouseover state" so i would assume the videos play looping all the time?
but instead i have just a white blank space. also all the other options do not work correctly.

thanks in advance.