Album link: https://imgur.com/a/I64sdOR
By looking at the other windows that function properly this one white lever should cause two little arm thingies to pull the two brown tabs inward and shut the window. The problem is neither or the metal bits inside the frame are doing their job. I sprayed both ports with WD40 and that did not help.
Pushing the window closed from the outside doesn't work either, it just bounces back to the position shown in pics 2 and 3 which lets in so much cold air.
Any ideas how to properly fix this? Or the type of latching mechanism even? Don't even know what to google.