We'll try to update Rocket.Chat upon new version update, it maybe there are some bugs. You can check their latest demo to see if there are still these problems:
https://demo.rocket.chat
Also what is your smartphone model and OS version ? maybe it's old and these are bugs in the OS or mobile browser.
M
I've tried the demo with no problems.
HTC M8, it's not just me, it's all the members using the chat. None of them are able to use it, all report the loading screen.
HTC Sense Version 7
Android 6.0
Soft# 6.20.531.5
Thank you.