weird error - with character "0"

[oren22a]

hello guys, using 1.7.7.0 PS here

i have managed to add required fields to the system.

but im encountering a wierd issue, with the letter "0"

even with system ready fields like "Address1" or "mobile phone" is claimed no input was given when i use the character "0" (other single char like 1 or "1" - works though)

 

its very strage, has anyone encountered this error yet? or been able to fix it?

adding photo of the problem

 

btw - i entered another PS website and tried to reproducde it - and it was error there as well!!

 

thanks!