Roku 4K+ turns on my home theater when I turn it off with universal remote.

My home theater has a blu-ray player and HTPC connected to the same receiver as my Roku 4K+, and when I use the computer or disc player, I turn the system on and off using a hub remote. However, after a session in which I haven't used the Roku, when I turn the system off using my hub remote, the Roku turns the TV and receiver on. How do I prevent this? Is there something in settings?