P80 g26 is this normal ? , slide moves a tiny bit

New build , took it out shooting yesterday for break in , ran great expect for one stovepipe, blaming either my 336 ejector or cheap 115gr ammo I was using, anyways when I got home I noticed my whole slide moved down a little if I pressed down on it , doesn’t move if I rack it back or if I have a full clip in , could these be due to it breaking in ? Don’t know if it did it before but I doubt it, any comments would be appreciated , my build is a Glock 26 , oem upk , oem lpk, oem barrel and mdx oem style slide