All questions related to installations, configurations and maintenance of Advanced Host Monitor (including additional tools such as RMA for Windows, RMA Manager, Web Servie, RCC).
I assume you set "content-type: application/json" line in HTTP header?
Then HostMonitor translates variable value according to JSON encoding rules. If your database reruns JSON compatible strings, I would suggest to remove such HTTP header.
We can add switch, some HTTP header like "hmvars: text", as "do not encode values" indicator.
Please contact support (by e-mail) in order to receive update.