Urgent Problem with data store

Hoping someone can help with this today.

I have a datastore where I want to add the button for the +1 qty
I have currently in the update have quantity + 1 however this is not increasing the qty is is only adding quantity +1 in the qty cell on the table and does not increase the qty

Heres a link to the page http://club.thegunnery.online/Admin-Add-Order
Any ideas?