Yeah that happened to me with DGAZ and DWTI last year. Bought DWTI at 60 and sold around 70 bought DGAZ around 6 sold around 8. Then DWTI went to 480 and DGAZ to 32 later in the year. Ugh.
So yeah I just had my entire margin account in DGAZ for a week and i sold half today. I'm holding the other half longer term.