Mysterious Stripes On Drywall

by Puzzled
(New York)

I built a new home a few years ago. A year later stripes began to appear on all the walls painted by the builder, but on none of the walls I painted. Also, there are no lines on the ceilings painted with sand paint, and no lines on any white walls painted with conventional eggshell EcoSpec. Walls I painted myself I primed first, then painted with two coats of BM EcoSpec. Walls the builder painted were not primed before they applied two coats of BM EcoSpec. Builder asserts they did not thin the paint. Walls were painted within days of hanging the rock during a snowy week in November. The mystery involves the "S" shaped line in the photo which appears to follow the adhesive, not the studs. The "S" covers three studs nailed together at a joint. Adhesive used by builder is Henkel's OSI Formula 38. Benjamin Moore denies EcoSpec has insufficient hold back capability as long as used as directed, which calls for primer. Finally, we do not burn candles, the rooms are all vented and kept clean and dry, we use radiant heat, we do not have a wood stove, walls are free of dust and have been wipe tested (magic eraser did not erase lines), all ruling out ghosting. The question is, what caused these lines to appear?