Hi, Clydey2Times,
Welcome to PokerStrategy.com!
Pokerstars has the ability to send you an item-by-item record of your account.
To request it from them, do the following:
Open the client & log in.
Open the cashier
In the centre of the lowest middle panel is a button marked "History" -- click it.
Select the time period you want, and click "Request Playing Audit"
I have that the same experience you are having -- my balance was lower that I thought it should be. In each case the situation was resolved by me realizing what I had done wrong.
I hope it turns out the same for you.
Best regards,
VS