When running more than one instance of the Awesome Miner main application, and both are configured to send data to the Cloud Services with the same Site Identifier, only the mining information from a single instance will be visible in the Cloud Services web interface.
The recommendation is to only run a single instance of Awesome Miner. The purpose of Awesome Miner is to provide centralized management for all mining operations. To run mining on multiple computers, download and install the Awesome Miner Remote Agent application on all computers that will be used for mining. Remote Agent should however not be installed on the computer where the Awesome Miner main application is installed.
When there is a need to have two instances of Awesome Miner, for example if multiple sites are used without a VPN network, each instance of Awesome Miner must be configured with a unique Site Identifier by following the steps in the the guide for Cloud Services - Configuration