Transition issue iOS

I have a form with angular validation, using $dirty
when I accessing that from some page, the validation appear from a sec. like get a bad transition, but it just on iOS, android is working fine.

I tried to search anywhere and cant find the solution, anyone can help?
thank you.

example code :

<div class="error-container text-left" ng-show="form.firstName.$invalid && form.firstName.$dirty">
    <p ng-show="form.firstName.$error.required" class="help-block" style="font-size: 12px" translate="VALIDATION.required">First name can not be empty</p>

but at the first time load the page, it still appear at the first load for couple sec.

some code examples??