So I got the filter and hoses back out from winter storage over the weekend. Hooked everything back up and started to fill. I dropped the pool water below the skimmer and return jet for the winter and plugged them both. I turn my pump on once i get to the right water level and now it's pushing water back through the skimmer instead of the return jet. Clueless as of why. When i shut everything down last year it was normal operation. I checked the valve on top the filter to release an air. All good there. Any clue what could possibly be going on?