Yes, this. @ 👆

It almost always will be a false start, unless you've been in contact with some other sourdough starter recently.

Just be patient, it takes time for the starters environment to get to the place where it's hostile to non-sourdough microorganisms, and friendly and full of happy sourdough critters.

The "undesirable" bacteria are actually fine at the start, their lifecycle just pushes the starter in the direction you want it to go (more acidic, probably other complex environmental changes)