Why is a starter all active and bubbly but doesn’t pass the floating test?

Profile picture for user donnnaaai

Hello everyone, anyone knows why is a starter all active and bubbly but doesn’t pass the floating test? I’ve discarded half and fed it again, it doubled in size but still doesn’t pass the test. Help

My starter never passes the float test. But...when I make the leaven the night before, the next morning, it usually does. That's when a float test matters, just before you prepare to make your dough. Not when you feed your starter. Measurements for leaven are different than those for starter.