We were at a tournament at Woodside in the Dells with a 17u academy team where I was an assistant coach. They had those temporary mounds made out of something like OSB with turf on it. We were playing against a team from Alabama and their pitcher was shoving it. He was probably 6' 3" and throwing low 90's. We got some hits early on.
Around the beginning of the third inning, our coach said, "You know, that mound doesn't look right." Sure enough, the temporary mound had moved forward about a foot or more. They moved it back -- we started hitting the ball and ended up winning.
Our pitcher was more of a junk pitcher (a good one, though). His breaking balls moved more (obviously). 👍