Please tell me what device you used (e.g. Raspberry Pi or something else), the version of the installer, and whether you cloned any SD cards. The most likely reason for this is that you cloned an SD card after running the installer.
Look for the file /etc/weaved/serial.txt on each platform. Check the number inside, e.g.
Is this the same on all devices? If so, on all devices except for one:
1) delete the file /etc/weaved/serial.txt
2) Run weavedinstaller and remove all services
3) Re-install your services
The installer "should" remove this file (which provides the Hardware ID) when you choose "Remove all services" from the weavedinstaller menu, but it doesn't. That is a bug and it will be resolved in the next release.