Trace Hit.Z varies strangely based on trace start/end Z

The Z value of a trace hit will vary based on the Z value of the start/end points of the trace. The larger the start/end Z range, the larger the variance of Hit.Z values.

1. Open UE4 Editor (Empty Blueprint Project with starter content)
2. Select Floor mesh and set location to (690.0, 460.0, 32.0 )
3. Set level blueprint as shown in attached image
4. PIE for 5 seconds
5. Exit PIE and open Output Log

Result:
Z value of trace hit varies even though object (Floor) and trace location are not changing

Expected:
Start/End height of the trace does not affect the height at which the hit occurs.