Wmv export glitched

i’m trying to export an animation with a quick tween movement on a detailed foreground. it plays just fine when i preview it in the program but when i export it it gets all glitched and laggy at the quick part of the tween. i checked the file in my editing software to see if it wasn’t just my movie player acting weird but the file lags in there as well. is there any way i can fix it? i don’t want to erase the keyframes or re-do the whole tween itself.
thank you in advance.
image reference below:

What Version/Build are you using of Harmony? Have you tried exporting it in another codec (mp4, mov) or even an image sequence?