Can Drinking Too Much Water Cause Drug Test To Be Inconclusive?

my pre emloyment drug test came back inconclusive, I did not have enough sample so they had be sit and drink alot of water to retest. I took the test again and drank 3-4 glasses of water an 1hr before test, i m concerned I will have the same prolem. I do not take drugs I m concerned I drank too much water.