Technical features of our exchange restrict certain types of transactions from being displayed on trader's accounts at HitBTC.
Specifically, multisignature transactions of XEM sent to your HitBTC account won't be visible. Same goes for mosaic transactions of XEM. Here's what such transactions look like in the blockchain:
Also please note that you would need to have your Payment ID (Message) specified in your XEM deposit. See details here: Where is my deposit?
In case you've performed multisignature or mosaic deposit to your account - please contact us via this form and we will make sure that proper solution will be provided: I have sent multisig/mosaic deposit.