Hi
The form for postal code on publish on phone edition only does not accept value with letters, only numbers can be select from the keyboard on phone. in Canada we use both letters and numbers, so i guess the field mandatory has to be modified.
Regards
Ghiz.

@Ghiz
It's text type so both types should work:
<input id="zip" type="text" name="zip" value="" class="valid">

I agree but each phone I tried here has the same keyboard number field impossible to set letters in postal code I sent a pic from a mobile view .
Regards.

@Ghiz
Your phone may recognize it based on name.

What should I do to fix ?

@Ghiz
No idea, it's obviously not theme related issue. Field is type text.

Hope you had the chance to try it on your own phone, wouldn't feel so alone...

@Ghiz
Yes I was testing it.
Go to file:
oc-content/themes/stela/js/global.js

And remove line:
$('input#zip, input#price').prop('type', 'number');

Tnx
I did removed this input#zip, works fine.
Regards
Ghiz.