Read only Shopper Fields not read only when should be ? bug ?

[16vmini]

ok , i am creating a credit system within My Joomla site , i have installed VM 2.0.14 to help me do this.

i have created a shopper field called "credit" , and have set this to "display only"  ( i am maintain this via triggers when credits are purchased)

anyway.. i noticed that when debugging something , when a user "saves" his account infomation , it was also saving this read only field !

i proved this by editing the input value using chrome's ability to edit page html .. and yes i was able to change this read only field and save it to the DB !! ?

now do people agree this is a bug ? can anyone else please confirm that happens to them ?

regards

Matt