reporting services - unwanted blank spaces in ssrs report -

i'm facing problem unwanted blank spaces between 2 text boxes in ssrs report. first testbox contains sub header(left-aligned), "summary". second text box contains comments. maximum limit 10000 characters. when googeld, found below calcualtions consider. corrected values satisfy conditions. still i'm facing problem. please suggest me fix issue. in advance.

note: text length in comments textbox 5200charcters.

page.height >= page.topmargin           + reportheader.height (no header)          + reportbody.height           + reportfooter.height (no footer)          + page.bottommargin 

my page values 24>=1 + 20.57513 + 1

page.width  >= page.leftmargin + reportbody.width + page.rightmargin 

my page values 15 >= 0.5 + 12.76427 + 0.5

it worked changing property of textbox. property:"keeptogether", value:false. shown paragraphs in pdf file desired without blank area.