Filtered water has higher TDS than tap water?

My water comes from a well in my yard and has a typical TDS value of 100-140 range.
I have installed a 2 stage micro biological filter that has a 5 micron particle and carbon filters.
After the installation I am getting a higher TDS reading from my filtered water (180-190) which is appox. 40 points higher than the untreated well water from tap.
There is no measuring error since I use the same TDS meter for measuring both sources.
Filter instructions states that I should run 7 gallons of water through the filter before it performs proper filtration.
While the initial numbers I read of 600-500 came down to 180-190 it is still higher than unfiltered water.
Does this make sense? How long does a basic water filter takes before it reaches to full performance?

I think your meter must be bad. My well reads the same before and after my filter, but my filter is just for filtering out the sand.

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