It's normal.  You play enough hands of PLO you will come across a swing like this at some point.  Swings are the same regardless of stakes.  

Btw, this is why bankroll management is such an important part of poker.  It's also what keeps the losing players in the game, so overall the swings are required for the ecosystem to work.

Big swings aren't that unusual in PLO.

A note of caution though, I read somewhere that due to some quirk in how all in EV is calculated by PT and HM, we will always run below EV over a large sample (something about how multi-way pots are done or something because it didn't apply to HU play). I could be wrong and can't remember my source, but it's certainly worth considering 'cas there may be issues causing you to lose beyond runbad (for example, your VPIP and PFR numbers diverge more than I would want).

Thank you for the answers, I will keep on grinding and maybe try to raise my PFR, and hope for the best.