Is it really one item in the marketplace or I don't see somehow? I heard that there could be a bug when you don't see, but I don't think that it can be so that you can see only one item and not the other.
There is about 7-8 items. The thing is you should leave the software running so it has time to see everything that gets broadcasted. Sometimes orders can get circulated and then those who weren't connected may take a day for it to get broadcast again while updating. Consider the markets are decentralized and serverless so unless you are always connected you might not see some orders.
Also, we are working on our Bitmessage relay which is basically giving users the option to run a strong server node to relay the traffic to those who missed it and increase the speed. It will be needed for web markets.