Opinions on this picture please

I have a similar "pattern" on the front of a 2007 terry dakota, but it is lower than the front window by about 8-12 inches and is about 6-8 in diameter. I see the bulge only in the warmth of the sun of mid summer. I am thinking mine came about from a leak in the front window but the water "trickled" down thru a joint in the substrate to the position where it could "pool" and affect the gluing. I am tempted to drill a small hole in the bubble and inject some glue and seal with sealant there after (have already done some resealing along the base of the window even though nothing was obvious (leak/hole)).

I suspect both our problems are caused by water being forced into the lower window seal during highway travel. :-(