Tilled gallery and photo scrolling freezes on mobile

hi

Not sure if this is a theme problem but when i try to scroll pages on iphone and ipad the page freezes when scrolling is actually made on photo by itself.

That is happening with tilled gallery as well. In result the page can’t be scrolled until the other part of page is touched and moved.

Please could you advice.

my website address is www dot shamackphotography dot co dot uk

Thank you

Shamack