After getting a partial fill on AMEX (the only exchange which handles SANM options), I lost my place in line, and someone else came before me for the next fill. That did not make sense to me. I contacted IB and complained about AMEX, but this is what IB responded to me:
"Dear Trader, Yes I...
I sold 1 option of SANM at $.10 on AMEX which is the only available options exchange for SANM,which shows I am first on line. Then, 29 more options were filled several minutes later, and the fill was not granted to me!? What is going on here?