TonyC,
Again, great advice. In fact I DID investigate, to a degree, when I received the email stating I would receive the payment.
I responded to the email and asked, "why am I being compensated for a settlement of an issue (grievance 02-02) which I was not even on the property to be affected by?" I also stated that I was affected by the events of postings 05-03 and 06-02, and asked if that was the reason.

E. Iverson replied to me that YES, I had hit the nail on the head, YES, it was a very complicated issue, YES, there is a grey area in our CBA concerning this, YES, call and talk to me about it, etc, etc. But I'm still at a loss to explain why I had to ask about it to receive it. I have always tried to maintain professional courtesy, and I certainly "asked nicely."