I am also having trouble with the threads twisting as I change direction. It has to twist either above or below my hand. I keep re-watching the video to see if Jane's hand position changes. There is some pronation (palm down) to supination (palm up) as she comes around the threads but at some point I have to let go, reposition my hand to keep it from twisting. This is a long thread. Does anyone ever replay with help?

I have major twisting of threads issue but don’t notice the “twisting” until I unravel my “chain”.
Now convinced the “twisting” doesn’t occur on warping board ….. it happens when making the “chain” as I make my body turn.

Yes the threads sometimes "realigned" but most times the threads would have to be unravelled before it cross over the "rattle".
Tension on my warp when making the chain.....I like to think that I've following "Jane's" technique . Again, I'm trying to following Jane's instructors when making the chain.
Now I'm very NEW at weaving. Only been 1 1/2 yrs. I always go back to Jane's Season 1 to watch warping and making a chain to ensure I do what she does.
Now I found a way around it....others recommended making an "easel" at the front of loom and there I can see the twisting and correct it before it passing over the "rattle".
My last project, Season 4 - Twills cut the pattern down from 10 yards to 5 yards hoping I'd get less twisted threads....less but still got some twisted.
Its ongoing learning experience with each project.
As I haven't weaved or warped in over 6 months, I went right back to Season 1 to watch all of Jane's lessons. WOW! Repetitiveness is very important...and feel more comfortable. This 5 yard warp went right in about 2 hours. Previously those 10 yard warps could and would take me days.

Thanks Ginette...

PS: My first lessons were with a weaving club and they said to do 2 sets of crosses in a warp. This last 5 yard I only did 1 cross as Jane showed and I'm hopeful that corrected my twisting. Red yard did 2 crosses and got twisting. Natural did 1 cross and NO TWISTING...