Cashout issue

Hi forum!
too many things here…

on the cashout process:

If a user requests an amount higher than is balance, the request is forwarded anyhow to admin.
There is no check.
Admin then can release the founds anyhow while the user is requested to settle the negative balance. i.e the user has 442$ in his balance, requests 500$ dollars, admin releases 500$. Then the user is prompted to refill his account with 58$.
Until the user doesn’t settle, if the user page is refreshed, another cashout request (same as previous) is issued.

This should not happen at all!
Am I mistaking or got a bad theme configuration or something?

Tanks as usual

Pietro