I'm not sure what happened, but surely there are some bugs to work out in the system.  It looks like what happened is you had a collision with d/q.  I show that someone else has that name as well.  BTW, you can do a complete scan of all claimed names using name_scan.

About not having to pay 50 for the second name, possibly the system detected that it took your NC by mistake when you tried to get d/q ?

If you are generating blocks then you will get some "transaction fees" from people running name_new and name_update.  I believe the "transaction fees" are one NC cent or 0.01 NC and the "network fees" are 50 NC right now and only occur during name_firstupdate commands.

I'll try to test registering the d/q when I get some more NC.  I spent it all already.