Walk-Run blend three glitchy thanslations

I've got two animations for walk and run states. I'd like to somehow blend between them.
Resulting animation is "stumbling". Probably because of different length of source animations.
I never worked with blend threes (and animations in general), so I'm not sure how to deal with it.

Walk
https://habrastorage.org/webt/_7/tr/ix/_7trixv7pgqehe6pihnqiwgteue.gif




Run


0.5 blend

 

you have to synchronize the animations.

whatever foot you start walk animation, the same should be for the run animation.
(so they are blended by normalized time, approx. in same pose they are in walk/run)

also the number of loops: I thought you can get away with if walk is 2 loops, run is 1
but no, just checked, it will mess up (walk making two steps while run 1, so it blends wrong)
your walk seems like playin the same twice, so just make it one loop