I figured out the issue.
See if i have a word of ten charecter long, i provided a space of only 5 charecters in my design so it gets wrpped in SSRS preview. But not gets wrapped in share point SSRS web part. Thats reason behind the alignment issues.
I checked by options setting can grow false . Still the word not get wrapped in share Point SSRS web part,
Ravi.S Chennai, Tamil Nadu, India