What are you comparing the readings "to"?????? You say it's overexposed two shutter wheel clicks, which is most likely 2/3 of an EV value...but...you are not stating how you are arriving at this conclusion. Are you comparing an incident light reading against a reading taken with the camera's built-in reflected light metering system? Or are you shooting photos based upon incident light readings and then transferring those readings to the camera and getting over-exposed images?
I ask because I know you are new to incident light metering (we've shared PM's about this), and I **suspect** that the meter might have had its adjustment screw turned a little bit by the prior owner...who maybe, just maybe....used Portra 160 as his film for flash shots, and who set the meter to read for a generous over-exposure of 2/3 of a stop, which brings the effective ISO down to 100, which is where MOST professional shooters expose Portra 160 color negative film....
Also, many portrait shooters will expose for the shadow values when shooting color negative film, whereas slide shooters and digital SLR shooters typically want to have their incident light meter set so that a highlight-side reading "pegs the high tones".
Anyway...there are a number of reasons that incident light flash meters have an adjustment screw hidden, usually underneath the battery compartment door...
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