I suspect your Results Browser object columns do not contain 0.0s.. they are most likely empty. If you do have empty columns when you send the object to the data table like you are showing in the picture, they will still show up as 0s just because it has to fill the data table with something.
I believe if you check the return code of your GetColumnMinMax calls you will find that it is returning 0 (FE_FAIL) for the empty columns. In that case, when the call fails, it isn't zeroing the previous Min/Max values and you are reporting them because you didn't check the return code. If you truly had columns with all zeros, it should return a return code of -1 (FE_OK) and Min/Max values of 0.0.