It doesn't necessarily mean that you're putting your money in w the worst hand. Here's how it works:
First, the Ev line only measures all in situations, not every decision you make. So this discussion is only for all-ins.
Let's say you go all in for $100 pf w a hand that's an 80/20 favorite at 100nl (I'm rounding - let's say you shoved AA's and got called by KK's). Your expected value
is $80. You win $100 (I'm ignoring rake and blinds to keep this simple). Your winnings line will show $100, your Ev line will show $80.
Let's say the next hand you go all in for $100 w a hand that's a 20/80 dog (again rounding - let's say you shoved KK's into AA's). Your expected value is $20. You win the hand, so now your winnings line shows $200 and your Ev line shows $100.
So you got it in good once and got it in bad once. Note that BOTH hands contributed to your Ev line going up. Note also that in BOTH hands you made the correct (standard) play. It's not really fair to think of this as sucking out.
Note also that your OVERALL PLAY ISN'T BEING MEASURED, ONLY ALL IN'S. So you could be the worst player in the world running really super hot in all in situations, or you could be the best player in the world running more or less normally.