Anyone want to give me a hand?

I have the BL Touch installed and responding. A G28 command homes X and Y and then Z. However, after it probes the Z axis twice it raises the Z axis a few mm. Is this normal?

I am following the Z-Offset guide: https://www.youtube.com/watch?v=OoWP5C8lSig

When I get to the point of off setting the Z using G92, I can only move the Z axis so much before it stops moving. This leaves the nozzle about 3-4 mm above the bed.

What am I missing?