This will depend on how you created your supervisor Report-Designer report. If you have a Designer report with only one table (containing results of only one query) in it, you should get what you want. If you have a designer report which actually holds two tables (containing results of two queries), in html these will probably be treated independently and your trouble of getting them lined-out will be lost.
suppose you have two queries (highly simplified):
select row_date, incalls from dvdn ;
select row_date, callsoffered from dsplit ;
and you create two tables, these will probably both contain data on each day, and thus each data-row appears in both tables......independently. In exporting to html, the exact screen lay-out is partly lost, and the fact that you had these tables next to each other is not exported to html. In a web-page, if it does not fit sidewise, it will fit lengthwise so there is a large liberty in changing page-layout when exporting to html.
If you have one query:
select dvdn.row_date, dvdn.incalls, dsplit.callsoffered
from dvdn, dsplit
where dvdn.row_date = dsplit.row_date ;
then you will have one table with data from both dvdn and dsplit. That should export perfectly to html.
Hope this helps.