I was putting two subreports together however noticed the title of the 2nd subreport didn’t “float”, checked its property, “float” was ticked, see screen shot below.
After 20 minutes of search, it turned out there was overlapping between the “title” and the subreport. OK, I guess Jasper Report could not guess what I meant to do correctly 🙂
Also if the rendered report was not what you expected after change, try save/build the same report several times so the engine can detects your change(I was using 6.10 and occasionally it could not detect the change in the first place)
Jasper report two subreports in one section