Editing coin's quantities on Android

Sometimes when I edit the quantities of my coins using my cellphone, updates are not saved.

Instead typing 0 on the value, I cut it, so when I refresh the page, the old value returns.

Is it a bug or a user failing procedure ?

Hello,
I assume you are using the "old" way to register your collection, i.e. with one input box per grade.
It's fine to just remove or cut out the quantity, this is equivalent to entering "0".
Just be careful to leave the box (e.g. click somewhere else on the page) before quitting the page. This will trigger saving the new quantity. When the new quantity is saved, the box' color change from pink back to white.

yes, I'm using the old management style.

I guess you said that the problem is in the gap between the chair and the keyboard.

Ok, i assume that's can be true, but I will try again and pay attention next time.