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I gain this problem only on real iPhone 6, and can't replicate it with Google Chrome's "Toggle device toolbar".
1) open chat in mobile portrait view. It looks normal:
2) rotate it to landscape view. It looks normal:
3) rotate it back to portrait view. It looks not good:
Can it be related to JomSocial? Can you please check it?
I am using android device, and cant replicate this issue as well.. maybe this issue only happens on iphone only.. not sure browser issue or our issue, but we will check it later as low priority.