HotSpot Module Shared Users Bandwidth Problem

Hello i have a routerboard750GL with latest firmware installed.

Im having problems with the Bandwidth distribution on Shared Users funtions at HotSpot Module.

i have a hotspot user with rate limit of 1M and 2 shared users.

when the user get logged in two times, each connection get a 1MB Rate limit, thats mean that this user can use 2M

this is a real problem, cause the clients can use more bandwith that they have paid.

Im not using User Manager addon,

anybody know a solutions for this problem?

many thanks!

See here:
http://forum.mikrotik.com/t/userman-bandwidth-on-shared-hotspot-users/46224/21