Default transfer values to and from pots

Here’s a little issue which seems more like a bug.
On the left is my Newcastle weekend away pot, on the right is my main account. As you can see the value to transfer defaults to 5 which obviously can’t be transfered, as pots can’t have negative values. the user either needs to type in the value they would like to transfer (£1.18) or what I do is type in a value greater than what I have which automatically matches the max value in the pot you can transfer (£1.18)
My suggestion is the text field should default to the value contained in the pot if it’s less than 5, same for transferring money to a pot (even with an overdraft)