New addition, tipped in the top sash of my double hung JelWen to remove it and found water dripping off the top aluminum and collecting on the top rail wood (wood interior aluminum exterior). Lots of water. Assuming its condensation. Only is happening on the larger windows with two latches, not on the smaller double hungs with only one center latch. I contacted the builder, who said he'll call JelWen-been waiting a couple weeks. Meanwhile, I can wipe off the water, shut the window, next day, more water dripping on the top rail. Window seems to shut tight. Any thoughts? I'm already at the stage I would trim, drywall is up tight to window frame, siding and trim outside are done.