signup problem with operamini mobile

Why can't i signup using operamini mobile?

Are you using the Turbo modes? One of them uses the old Presto engine that breaks things. Make sure Turbo is completely turned off. Also, what version of Opera Mini and device? And because I forgot to ask at first: what exactly is the issue?

Well, after close observation. I can see from here that opera isn't full supported because some functions isn't working. While trying to signup i see the dateofbirth selector not popping out after clicking, likewise the picture selector, it all jist load and come back without directing to where necessary. I use the latest version of operamini and also htc m8, i don't think this is caused by phone because i was able to reproduce this on a samsung android note3

Did you turn off Turbo? Also, does Chrome for Android work? Both use the same engine.

Yes ,turbo off, but still the same. Have tried using chrome for android,chrome works fine and singup is successful. This only seem to happen on opera mobile.