Whirlpool dishwasher keeps pumping / draining

I just moved into a new apartment. I first ran a cleaning cycle with specialized cleaner, it finished this cycle normally. Then I ran a cycle with a load of dishes. It kept pumping, and the timer remained stuck on 15 minutes. I’ve cleaned the filters, these had a sort of slimy film in them. I’ve poked around the drain hole as well. That’s all the technical know how I unleashed on this thing. Video attached where there’s a little water spout visible? At some point I turned it off, and there was a layer of water remaining. It kept draining with the door open. At some point there was a layer of water almost to the top of the drain hole, then it drained all the way down to the level you see in the video. I have no clue about any of this and my brain is completely fried from exhaustion and stress, please explain it to me like I’m five. Thank you very much.