Fit Improvisation has been really bugging me...

... and I have no clue what to do about it... so I recorded a video of what I'm experiencing.

Basically, I've found that using Fit Improvisation clearly messes with note lengths and relationships in a detrimental way. Using one of my more advanced Kontakt instruments, I show how a line that was perfectly fine is mangled when using fit to improvisation.
 
Tried this out in both Gloucester and Ipswich and the behavior is the exact same.
 
Would appreciate any help anyone can shed on this. :(
 
https://youtu.be/_r_FzqKG8nU