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Yeah, the lack of numbers after E is what's causing the Egg move issues. For instance, Pidgey can currently have all of Faint Attack, Foresight, Pursuit, and Steel Wing on one set because they're all just 2E. It should be Faint Attack (2E0, 2E1), Foresight (2E0), Pursuit (2E1, 2E2), and Steel Wing (2E2), making the only possible combinations Faint Attack + Foresight, Faint Attack + Pursuit, and Pursuit + Steel Wing.

Anything in the Field Egg Group doesn't have this issue, which is why I was asking if they should all be 2E or 2E0 (everything there can breed with Smeargle, making all Egg move combos possible.)

It is a bug because the engine thinks that mons can be bred on gen 1 I think, the number doesnt' matter, egg moves are calculated upon group to see which ones are possible together and which ones aren't.

I need to run some tests but I think I can fix it without adding numbers!

The gen 1 legality issues and the other Egg legality issues are different. The gen 1 problem is what's causing errors with Cloyster and company. This Egg one is causing errors with basically everything outside of the Field Egg Group :x