Mystery of twisted fabric solved?

I came to put a new warp on my little Greg Meyer loom, and discovered this:

The bar I'm tying my warp to is sitting crooked. It was the same both front and back of the loom, how careless of me! This may have been a factor that helped create curved cloth.

I replaced the string ties with texsolv so it is easy to get them exactly the same length.

It's also easy to do up / undo the texsolv by removing the little anchor peg.