Not many talk about this but the Nox can, and sometimes will up-average if conditions are right and you are in the vicinity of iron.
Doesn't have to be huge iron either, it just has to be in the wrong place at the wrong time.
I hunt in Hemetite filled Fe 2o 3 mineralized soil with extra massive iron everywhere I go and I have seen this happen a lot on just about every hunt.
It happened before the update and it still happens after on mine, it happens on my usual Field 2 but also on all the other program choices....and I have used them all from Park to Beach.
Corrosion might have something to do with it but I don't know why it would and what exactly is corroded?
My zincs usually never come out of the ground whole but my coppers always do...they might be super crusty and thickly coated with dried clay but I can't recall any with corrosion unless you are talking about that beautiful green patina some of the older ones have.
Many times the thing is dead on the right numbers but I can't count how many times I have dug copper cents and dimes in high 20's to low 30's, zincs in the mid 20's and even an odd nickel or two in the zinc area.
Mid 30's on some quarters a lot, too, you should have seen my face and how shocked I was once when I went after a 35 signal expecting a clad quarter and a beautiful Walker came up instead.
Never had a thought it would be a half I am so conditioned to seeing this effect it happens so much around here.
I think mine does this stuff on purpose just to keep me in my toes but I don't care, I just dig the solid tones and numbers wherever they end up to be and I am usually rewarded.
I have well over 1000 hours using an F70 and Fishers are well known for up-averaging around iron all the time and boy mine does it too.
No big deal, on both I learned to understand this phenomena and ultimately use it to my advantage once I realized exactly what was happening.
You would be surprised how much great stuff I have found living in the ground with iron once I got used to this.
Just don't count on targets behaving logically all the time, every time...open your mind up to noticing more than just the normal numbers and you will be fine.
Next time this happens move the offending coin to a different area and scan it again out of the ground, I think you will find they all revert back to normal numbers if you do.
Then search around for iron in the vicinity, bet you will find some shallow, deep or inbetween or if you happen to hunt in ferris oxide dirt like me that will trigger it with no other iron than that, in damp or wet soil especially.
Unusually high numbers with a little iron indication with the horseshoe on...dig it.
Horseshoe off but low disc and an iron hut with higher weird numbers...dig it.
Horseshoe off and using higher disc with unusual higher numbers and no iron hits...dig it.
Hunting in red clay iron mineralized dirt and no iron but weird numbers...dig them also.
Don't assume, this sneaky little Nox is hoping you will do just that.
Adjusting sense and whatever else might help with this but if you embrace this odd effect and learn to use it you also will be rewarded.
It also could be something else completely causing this in your case because it only happens in a few copper cents but in my gut I am still going to go with up-averaging...cause I'm stubborn.
