Can't lower monsters hp?

Tried relogging and @dispose, but still nothing works. I'm not lagging, and I just can't spot the problem. It seems that other players can hit monsters and kill them.
Please help?

P.S.: When will the All-In-One Shop be available? No rush, I just want to know when it should be finished. A GM already told me it'll be done by evening, but I forgot to ask the time xD.
I LOVE the server, but just this one small thing: you shouldn't put the "Travel" option at the Job Advance section, its very hard to find Spinel that way, so please change it!