What arrow keys? There isn’t any arrow keys on the onscreen keyboard any more than there is a mouse cursor anywhere. iOS does away with all that legacy stuff.
It can be worked around in a horribly tedious process, where I have to check the product names on the site, and then type something short that matches just few product names but it’s really not sustainable.
If you need any help on trying to fix it just please ask, I’ll do my best to help in any way I can.