NEM foundation is working on implementing Catapult behind the scenes. Deposits are "missing" everywhere. Just hang tight, your XEM should be growing in value while you wait for it to magically reappear.
Markets have lost their downward momentum, and are in strong growth now. Might see prices waver around a bit, but overall should see a powerful comeback.

The market is under no obligation to make sense to you. But since you asked - people oversold. People like you joined the FUD bandwagon, but now the wind is out of your sails, the momentum has joined our side, and we shall begin to explore new heights without you.