Fog of war LOS glicth?

image 1 starting Point
image 2 token moves to the top
image 3 token 2 only sees the starting and stopping points, not the path from image 2
image 4 token now continues down to the bottom
image 5 again token 2 only sees the starting and stopping points but not the path taken

I can't figure out why this is happening.

It's a basic map with nothing added. LOS, Lighting and player preview mode are enabled.

I restarted the program and reset the tokens. No vision on the tokens, Just candles as light sources.

BTW, if a 3rd token was on the screen and hadn't been clicked at all, he would see nothing as though the 1st token had never moved.

5E