I have two freeswitch servers load balancing is happening through opensips at front

I am using mod_db of freeswitch to have centralized database for account based call limit over both freeswitch

I have configured db.conf.xml settings with
<param name="odbc-dsn" value="freeswitch:umn:pwd"/>

However, when i set the limit per account freeswitch wont restrict call attempt as it should be.

What could be the possible issue?