If you can see the transaction on the ethereum block explorer as $30 worth of ETH, then you should receive $30 worth of ETH. You hold your own private keys with Exodus so there is no way that you are going to somehow lose $20 without reason.

I can assure you that Exodus is 100% legit. You don't even need to trust them that much to use their service.

I've stored way more than $30 in their wallet, nothing has ever happened to those funds.