nonexistent herd keeps making baby beefalo

The problem you did was telelocating the last beefalo. 
If you want to change the herd point you need to use a beefalo horn and lure it to your desired spot. 
When you had telelocated your beefalo, that beefalo is now trying to walk to its original herd point (due to being too far out of its home) to before you telelocated.

Herd entities do not spawn where the parent is but instead where the herd point is. That is why there was a baby beefalo where the original beefalo was at pre-telelocated.

 

Edit: The herd point is mostly detectable during Dusk as Herd entities (Beefalo, Volt Goats, Mooslings, etc) crowd among themselves in a single spot. Think of it as an invisible pole with invisible leashes on every single entity that's attached to the herd point. If they walk too far from the herd point, they are forced to walk closer to it (and prevents the herd point from updating). During Dusk, the range of which they are able to walk away from the herd point is decreased (and expands again when Daylight hits)

Edited August 26, 2020 by VriskWhisk