fozgometer readings all of a sudden much higher after retip

My cartridge used to read right around the center 20.   Now I am reading around 30.  Just had the cartridge retipped by Andy.  Seems a bit weird.  What could be causing this?
No cause for alarm...just a bit different with the retipping.  Just adjust again per the Fozgo...

Could be both Stylus were "in spec" but the new one has zero wear and causing a diff reading.  

The Foz is very sensitive to the battery that's powering it.  If I haven't used my Foz for a couple of months, I get a new battery for it.
Thanks for the feedback.  Just seemed like they always read right around 20(center).  I will try a new battery as the one inside is older
Yes, add a new battery.