fields get overwritten

I am using Crystal Reports through a Rational product - ClearQuest. All fields have been defined in ClearQuest and I just insert the field objects in the report design. The fields that I use are of type text and vary in their size (and could be 1 line or 50 lines). When I place these fields one below the other, they get overwritten. The second field that comes below the first one should start a couple of lines on completion of the first one.
What should I do to prevent this?