Submitted by gpersoon
The code has two implementations of msgSender:
_msgSender() is used in a few locations
It is confusing to have multiple functions with almost the same name, this could easily lead to mistakes.
Recommend double-checking the use of  _msgSender() in withdraw and adjust if necessary. Also, adding comments when using  _msgSender(). And finally consider overriding _msgSender(), as is done in the example here:
Splidge (Reality Cards) confirmed:
Splidge (Reality Cards) patched:
