I ran following two experiment runs, which had exact same target but different runname:

          nbfake make restart RUNNAME=test_all_vias_TotemCsraVfi MODE=SLES12
          nbfake make restart RUNNAME=test2_all_vias_TotemCsraVfi MODE=SLES12

Then, I wanted to delete the run areas for the first run, so I issued the following command:
          megatest -remove-runs -target -runname test_all_vias_TotemCsraVfi -testpatt %

But, strangely, it deleted both the runs!