Phone Number Error Problem in Google Chrome. Please Help!

[az1000]

Hello Everybody. My store in Prestashop is Ready 80-85%. But When test store in other computer in Google Chrome browser was problem. Checkout was in instant checkout. Filled All fills and when click save there write that phone number is error. I deactivated phone number from admin panel. (preferences-customers-phone number (NO). But we try it in internet explorer browser wasn't problem. I try and test it in my computer in google chrome and in firefox wasn't problem. Then we clear cashe in Chrome wasn't Problem and everything was good and no problem. I want to know was this accident for anybody? And how to solve it? What may be problem and how can i do anything that was not same problem in future?
Please Help Me who knows how to solve it. 

 

Thanks in Advance.