Brocade graph issues / negative percentage

Observium shows Auth Error randomly on graphs related to Brocade devices (especially Bigiron RX series).

Observium shows negative graphs, for example showing Memory Pool tab for brocade device:

Used -512MB (25%) / Free -1.5GB (75%) / Total -2GB

Also the percentage is wrong, it shows 300% usage while it was showing actual usage before observium becomes 2 versions of community and professional, as soon as I upgraded to latest community edition after this change, it started all the above behaviors.

Please fix them ASAP.

Thanks,