Oh yeah, Potassium symbol was broken in some places before - I think it is fixed now (Potash is now K2CO3), but if you see any specific examples in the latest build let me know!
For logic gates, they are all facing down right now - the input spaces are top left and top right relative to the gate pixel, and the output is below it (except for the NOT gate, where the input is directly above). I'm still trying to think about the best way to implement them bc it feels a little weird to have 4 directional variants, but I need some way of defining what the inputs and outputs are, but the gates in there now are actually usable :)