Bump in Z axis on X and Y graphs

Hey guys! Had a problem with strange vibrations through my prints. From the feel and sound thought about defective X carriage - when you are moving it by hand with belts, you can feel ballbearings “rattling” inside. Change to another one supplied with the kit - same result, changed the carriage to HIWIN Z1 preloaded - much better, but still feel this “rattling”. On the graph there is constant bump on specific Hz on X and Y graph. One of the discord members told it may be the carriage problem. Can this be true or should I investigate further other components (they seemed fine)? What usually the bump on Z suggests? Hybrid 500x500 v core 4