Why does the RAS data probe point coord not match visually in the volume?

Why does my data probe not match the markup visually? I had to apply a negative to the superior value to make the markup point match with my cursor on the data probe. If I were to markup the same as the data probe RAS coords suggests, it would be outside of the volume.

The data probe is indicating “I” (inferior) while the markup control point is reporting “S” (superior) coordinates.

Thank you! I didn’t notice that.