For the calculation of the backtracking angle, PVsyst has to use the pitch and wdth of 2 adjacent trackers.
This is only possible with trackers of a same tracker object (array of trackers). When you have several arrays of trackers, PVsyst will choose the more "narrow" as reference.
I read this as stating that PVsyst requires two trackers to be at the same orientation (no misalign or azimuth changes). If I have two trackers of the same orientation, and another two that are misaligned which are adjacent to the first two, is this acceptable and able to be properly captured? See image for reference.