@ipaterson. I know you got a lot of stuff going on with upcoming features and all.
However, ever since the release with the ability to rearrange variables while editing pistons, I have noticed a bug. This only happens when using the iPad, which happens to be on iOS 12. When editing a piston from chrome or the mobile app, sometimes if you touch a variable with your finger, or move your finger across the variables; they will disappear. It looks like they have been erased, however if you save the piston they come back.
It is a little annoyance I can live with, but it is there just the same.