The same issue discussed here:
FYI: https://community.theturninggate.net/topic/2589/photoswipe-problems-on-mobile-devices/
Where they point to https://theturninggate.net/2013/11/hurray-for-updates-ce3-updates/ and basically it says that it’s a Chrome issue… but since the FooBox is working I think it’s a Photoswipe bug.
On the Photoswipe project site https://photoswipe.com/ is stated that it’s under development so I hope they’ll release it soon and it’ll be fixed.