I ended up getting 2500 ac from the steam store when i logged in it said i got 2500 ac, but when i went to the ac shop it said i had 4500 ac. this was the 1st time i got ac

so you purchased 1 time 500 and 2 times 1000? maybe you bought a 3000 pack instead of a 1000 by accident? cant think of anything else

I'd check your card/bank statement to make sure you didn't accidentally bought more than you intended.

it seems it was a display error. logging out and back in fixed it