For the program to place two bars of the same length, edit the joist top reinforcement tables ( Job > General data > By position > Rib top reinforcement table icon > Joist top reinforcement tables). Here, delete all the 1fn + 1fn entries and substitute them with 2fn (the program interprets the two bars have to be the same). This does not imply that due to the presence of the 2fn entries, that two bars will always be provided. If only one bar is required, one will be placed but if two are required, two will be placed with the same length.