have you recently paid for something through paypal, AFTER you received this payment?
I asked what may seem like a stupid question because I was recently caught out with paypal.
I thought the money had not found its way into my paypal account, but it in fact had, and was then used for another transaction.
There was no evidence for this at all on paypal, hence it catching me out.
I don't remember exact figures, but I'll give you an example.
I recieved a payment of £20.
Before I had a chance to make sure the money had been put into my paypal balance, I purchased an item worth £35 from an independent shop completely unrelated to the original received payment of £20 I got!
The item I purchased was paid for partly through my paypal balance and partly my bank account. This was news to me, as I thought the entire thing would come out of my bank account!
So my paypal account went down to 0, and £15 was withdrawn from my account. I presumed the full £35 would come from my account, leaving me with £20 in my paypal balance.
There was no information at all of this on paypal, and I didn't realise it had happened for a while, as I wasn't looking for a £15 withdrawal from my bank account!
I finally realised what had happened, and felt royally dumb. Its strange there is no indication of this at all on paypal, it seems to catch a few people out!
Perhaps a similar thing has happened to you, or perhaps your not a dope like me