Why is my Anim Montage is skipping frames when played in game?

in the Animation tab My Montage plays fine but reasons unknown to me when i play it in-game The montage skips the first 0.15 seconds of the animation and what looks like the last couple frames at the end of the Animation.

ive tried every thing from adjusting blend in and blend out times and changing the rate scale the only success ive had in playing the animation is slowing it down dramatically, and at that point the animation loses its desired affect.

if anyone has any suggestions or solutions to this problem any help is much appreciated.

I have the same problem whit my characters at import the animation see ok but in game look like is cutting frame don’t look fluid.