I purchased KVS because I thought it would help me with booking *A awards on a trip to Europe and MLE, but I'm running in to a few problems...

A few days ago, UA's site showed Business Saver availability for 2 seats on Sep 24 from MLE to IST (TK 731, departing 23:40). Today it doesn't show up. However, KVS does show "CS" availability. I looked on UA's site again right after, and again it shows as "not available" for Business Saver.

Which tool is right?

I'm using the "Awards/StarAlliance" search method