I found the same.
I experimented with Ergon grips on a cheaper non folding Humpert bar.
The removable ends let you fit the Ergon grips, brakes and Rohloff gear changer onto the straight parts of the centre section, but the curve at the bar ends forces the ergon grips and thus everything else inward.
Fine if you like the grips closer in, but not so fine if you like the width of 'Thorn Comfort' bars.
Julian.