Ok as i have noticed myself and many others which are having the current problem, iphone 5s is not being fully compatible for Graalonline Era as when required to zoom in after a couple of times this occurs:
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The only way to fix this was going out of the app, closing it and reopening which to be honest has caused me doing it several times while in events causing me to warp back to hospital.So i hope someone can do something about this to fix it and thank you.