Asset Warp Tool Colour Glitching?

I'm currently making animation for game sprites, and a couple of characters look best with a warp tool due to their design. My first sprite, a dolphin, worked perfectly with the asset warp tool and had no issues. Recently however, every time I just to move anchor points on a warped image causes the colours to either vanish or switch which makes it impossible to work with. The only thing I can recall doing different to my first attempt was update the app and others agree it appears to be a glitch.

I've attached a mp4 file showcasing the issue. I thought it initially might be the way as I was colouring since I would colour in sepereate layers underneath the linework and then merge it all together, so I tried just colouring all on the single layer but that didn't help either.