Telemetry from device that has NOT been selected.

**Describe the bug**
Start Telemetry from a device (in my case GFSDev002), and I'm getting telemetry from device GFSDev001.

**To Reproduce**
Each device has its own connection string.

**Expected behavior**
Starting telemetry for GFSDev002, should only show Telemetry sent by GFSDev002.

**Screenshots**

**Desktop (please complete the following information):**
- OS: Windows 10
- OS Version: 10
- App version: alpha

**Additional context**
I'm thinking the IOT Explorer is subscribing to the Consumer Group, rather than the device? If so, then the title is confusing as it clearly states it Telemetry from GFSDev002.

Reproduce the issue in the application using separate connection strings for GFSDev001 and GFSDev002, then trace the telemetry subscription and selected-device flow. No source files or tests are named in the issue. Done means starting telemetry for GFSDev002 displays only telemetry from GFSDev002.

Written by the indexing model from the issue text.