the in queue items are in the mobileadmin schema in the table c$inq (if i recall correctly) if you delete those rows the inqueu will clear but i guess that some error must have occured
if you go from the webtogo page and open the in queue select the item and then see the querys field and type e.g. update ...is there a problem with those queries?
possibly one of them or all have a problem, e.g. primary key violation? missing data on server(client updated a row that doesnt exist now on server?)
something like that? ofc usually those rows will go on the error queue and not stay frozen in the in queue.
make sure you have the latest patches installed if we are talking for 10.3.0.3 cause there were some problems like that if i recall and a patch fixed that.
if your talking about 11g the new version better open a service request with oracle.