It's not happening with my Samsung S6 and Chrome. Can you maybe test with another browser on your mobile talkingpeanut
?
It sounds like a browser issue and not something we can do much about on the site's end other than maybe limit the number of photos per post. I will pass this along to our tech team though, maybe they can think of something. I'll wait to see if you're having the same problem when using a different browser on your phone.