Pattern alignment win on a recent install, but glue confusion lingers

Just finished a job with a chevron style carpet. Usually my seams show a little. This time I measured the repeat twice before cutting. Laid the pieces side by side on the floor. Used a sharp blade and steady hand. The pattern matched up almost perfectly. Felt really good to see it come together. But now I'm wondering about glue types for different paddings. Why does some adhesive bubble up with rubber pad? Does temperature play a part? Would appreciate any advice from you all.