spawn offspring spinner goes to 10000000 if i click up or down, even if i'm on 1.
v0.16029
Tried it here and it doesn't happen, also checked the code and the spinner arrows are set to increment the value by 1, so I can't see what would be causing that.
You're talking about the "Offspring" spinner, directly below the "Spawn %" spinner within the Spawn operator? What version of max are you using?
Still can't repro. Do you have any spinner snap settings toggled? Customize->Preferences->Spinners