It looks like the seal on the element might have a small leak. I would replace the element and probably the anode as well and you should get more time out of it.

I believe it’s called a mullion. It is a hard plastic strip that snaps into a groove to lock the window pane to the door frame. They can be purchased but they have to be the exact size and profile which can make it difficult to get. You might be able to work it back into the groove and snap it into place.