1.) Check the report to make sure it is with in the boundaries of the page size. (To get the Report properties click on the left corner at the top of the report designer, when you have done it correctly a black square appears - go to the other side of the screen and click the properties panel.) Page Size property should be 8.5in, 11in or 11in, 8.5in. Make sure also that the report will fit into either those two sizes. If the report is bigger then the page size you will get most of first page of your report on one page and the rest on the second.
2.) Make sure the margins are correct. If you report size is 8in across and your margins are set at 2 in left and right then it will print the first page an two different pages. (That will make your report actually 12 in across so, set you margins at .2in or something that is mathematically correct.)
3.) Also, if the left right margins are not helping with the issue, change the top and bottom margins to .5in or even less, which will sometimes help.
4.) CanGrow property for the textboxes is sometimes the culprit but I can not confirm or deny that.
I hope that helps. I had to write up something for work sor that problem.