When you use the ShapeShift widget in MetaMask, you're not sending BTC to MetaMask - rather you're sending BTC to Shapeshift (the widget you chose) to exchange it for ETH which will be sent to your account. This normally happens without issue, but as you may know, BTC confirmation times can be dreadfully slow and sometimes take so long that the Shapeshift transaction times out. This is why you must include a refund address so if it times out, your BTC will be sent back to you.
If you have specific questions about this trade, you should reach out to Shapeshift directly with your address and TX ID of what you sent. You can do so here.