Problem with user manager - hotspot

Dear Alll
thank you for you help and support

i recently activated user manager on 6.25 2011 rb
and connect it and working fine with hotspot and i made limit for 30day
i just have one problem

that in the user manager – users -
there is two options always unlimited for all users (till time- end time) why is that although in the winbox
ip—hotspot—active it show the session time left ??

what is the problem ???

and one more thing what is the CoA option support on user manager ?? when i active it the (session time left) in the active table ?

thank you all for support