Window pane gap on one side!

I have a large picture window 68″ x 65″. It seems that somehow it has shifted to the left (from in the house looking outward). Is this even possible? or was it not installed correctly? We have lived here for 7 seven years without any leaks or water issues. Today I power washed the window to clean it, and in doing so I blew out some of the insulation on one side of the window (left looking in, right looking out). If you look at the closeup photos that include my fingers the water flashing can be pushed right past the edge of the glass. The only thing I could think of was to buy some window suction cups to hopefully move the whole pane over so it at least gets just past the edge of the glass. I’m really handy, but have no experience with windows. Am I on the right track here thinking I can simply the pane from one side to the other? Thank you.