Can anyone tell me why the oxidation would be high on sample with nothing else on the sample at or near the same level

Ox at 16 - 22 with a clean sample 18/16/13

I assume that the lab is using FTIR to determine an oxidation value. There is no correlation to oxidation and particle count. Much more information is required to give an adequate interpretation of this data. And, please remember that oil analysis is a trending tool, not necessarily a snapshot tool.

Yes this is the way I use it, I had a batch of samples come back and everything normal but the oxidation was high. No one can seem to tell me what would cause this reading.Signum/Mobile offered little info other than look at the trending.

Sometimes, very sudden spike in oxidation can be due to changes in oil formulation.

Often if it is oxidation of oil, it will normally be a gradual increase over time but you need to confirm this with other test parameters such increase in Total Acid Number of the used oil over new and increases in viscosity.
It is also a possibility that the lab has an auto sampler and the previous sample to your sample had a high oxidation value - so it was carry over from previous sample.
You need to resample and retest to confirm the sudden spike in oxidation value and interpret in conjunction with other tests.

The patch test quoted does not have any bearing on the oxidation of the oil. However, if you are using the patch test in conjunction with a varnish index comparator - then it can be more indicative of the oil condition.