No negative Balance protection, beware!!

So I decided to deposit a small amount to PrimeXBT to test it out.  It was only .01375BTC (less than $100) and decided to go all in long at an average BTC price of $5,830.  I figured I would just go to bed as I was pretty sure I was going to be liquidated overnight if the balance got too low.  I forgot about it until the following afternoon and received no e-mail notification to inform me I was liquidated, even though BTC was down to $5,675.

I log in and find out my available margin is negative 475% and they did not liquidate my position or give me a warning about my margin!!  After quickly closing positions my balance was negative .06BTC.  Now that is not a huge amount of money, however, it's quite concerning that if I had done a much larger trade that my balance could be potentially be in the negative in many multiples of what I put in to trade.  Had I not logged in and BTC continued to drop who knows how much I would have owed.  As far as I know, all of the other leveraged trading sites have negative balance protection.  Thoughts on this?