Strange. I tried upvoting you but it's not showing any amount.

Never mind, I see this post is almost a year old...

Were you involved in the ICO phase? If so, then you should follow step 6 that is posted below because OpenLedger probably technically owns your EOS if you don't. (Your keys your coins, not your keys, not your coins) I haven't checked if this has been changed since the opening of the EOS blockchain in June so maybe this is no longer the case.

If you weren't involved in the ICO, you'll want to set up a wallet on the EOS blockchain directly.

The discrepancy might be the transaction fee if it was measured in bitshares (other tokens are sometimes used if you get back change). When you buy on bitshares, you'll typically go through several sources to find other users willing to sell to you. If you buy a large enough amount, then it's unlikely that their sell price is the same throughout.