NiceHash buyer here, I think I got really screwed on a Fixed order. Can someone who understands all this help me figure this out?

So here is the setup: Purchased 1BTC of hash time mining Equihash on Autoswitching @ 5.2 BTC/MSols/Day, miner completed after a few hours as I had the limit set to .75. There are now 3.57119804 ZEC in my zcash pool wallet. That converts to around .54 BTC. So for my trouble I have lost around $1000. Where did I go wrong?