I have found that if I create a table with 4 columns it triggers this behavior. If you do have a table with 4 reduce it to 3 and let me know what happens.
I figured this out, it turns out that the page size was set too wide and too long, I figured that the report would cut it off and discard it but it seems to have been the reason it was adding that extra white space. scaled down the page to 8.5in x 3in and the report works perfectly now.
I did try that 3 column thing first (my second table was 3 columns) but that didn't have an affect.
For as useful and robust as this program can be, it has some stupid quirks