Didn't you read this thread, the split PNR is YOUR fault!
SHARES rebook -- and splitting PNR's
The combination of posts #33 and #37 clearly state that if you asked to be on the UG list, then you also asked for your PNR to be split. Clearly, you should know better.
Edit: Just re-read your post. You didn't ask to be on the UG, list and STILL got auto-split? Wow, I guess the paid spin-masters are working overtime on Easter Sunday to gin up a story for that one!