A friend just showed me an active armor fit for PvE, asking for my opinion. It had 3x Nanobot Accelerator I rigs. Leaving cap considerations aside, I know an Auxiliary Nano Pump I rig instead of one of the nanobots would be better because those rigs are stack penalised, but she told me the repair stats were better with the 3 nanobots instead, so I checked the fit in the fitting window and she was right…
Now I know this cannot be, because the 15% reduction in repair cycle time that a Nanobot Accelerator I provides means a 1/0.85 = 1.17647 = 17.647% increase in repair rate, which is only slightly better than the 15% increase an Auxiliary Nano Pump I provides, so there is no way a 3rd (stack penalised) nanobot could give better repair rate than a not penalised nano pump.
So I made the math manually, adding one rig at a time, and it seems the fitting window doesn’t apply the stack penalty to those rigs at all, each additional Nanobot Accelerator I rig consistently increases the armor repair rate by 17.647%, no matter how many rigs of the same type are fitted already.
Is this a known bug? If it is, does the bug affect the fitting window only or also the game mechanics, i.e. are the fitting window stats consistent with what actually happens in game? Am I missing or misunderstanding something here?