Have you received an offer to send these domains to auction from a Sedo agent? Simply listing them for sale on Sedo doesn't mean you are obliged to sell them at any specific price. In order for the names to go to auction you must either receive an offer and send it to auction at that price (which becomes the reserve) or negotiate starting an auction with a Sedo agent.
Hope that helps.
One more thing, the minimum offer price on Sedo is $60 (US). So if you do start an auction and receive a bid you will be guaranteed at least this much. The problem is that Sedo's commission rate is 10% with a minimum $50 (US) for .mobi domains which are not currently parked with Sedo. In other words, if your auction closes at $60 and Sedo charges $50, your net gain is $10 (i.e. likely less than your reg fee). Long and short, if you do list your domains at Sedo, it would be wise to park them there as well.