Ok, found out what’s going on. It’s technically not the same wave – it’s a different variation of the Egg Cannon. Wave 1 has SSH difficulty 44%, wave 2 has 55%. Above 50% the Egg Cannon’s second variation starts appearing.
Egg Cannon and Henterprise variations are not lumped together (only the Crab is). If I recall correctly, this was requested so you can fight them more than once in a given mission.
So, won’t fix. But your original medal stands, because the appearance probability did indeed have a problem.
@Recruit_75 I’ll award your medal now.
@minasameh Already fixed