"Need to check your glass it sounds like a prism offset setting is not properly set in the EDM.
Do a peg test:
Setup 3 Tripods with Tribrachs in a straight line about 50 meters apart. 1 - 2 - 3
Set Instrument on 1 measure…"
"First check the culmination of the instruments and run the calibration routine.
Check EDM ppm and prism offset settings.
Check optical plumbs on all tribrachs
Check level bubbles on instrument tribrachs and rods
Run 3 tripod peg test on the…"
"First of all the only instruments I have bought or used for the last 45 years have been Wild / Leica instruments. The work better than any thing else. I still have some T2002 and T3000's that are more dependable than any of the new stuff.