is the LFS
is doing the testing, is it the same person or different people who do it for you? if it is different people, its likely they are doing a fine job and they are not getting false positives. what were the test results for nitrates and nitrites, this would be a strong indicator on if your tank is actually cycling or not.
i would strongly recommend investing in a testing kit for your self... stay away from the strips and go for the one with the test tubes and droppers... must more accurate.