Maybe this has been reported? I checked the list and did not see it.
Example -------------- When you have Shar-Teel here, she starts dual-wielding a Long Sword and Dagger. Looking at the screenshot (see below) you can see that Long Sword is erroneously listed twice. It should list Long Sword and Dagger. When I change out the dagger with another dagger, the second (circled) Longsword THACO modifier changes.