Resoloution not changing from 4k when playing a 1080p streaming source

Hi,

For my setup to work, I need Kodi to change from 4k back to 1080p when the source changes. I've set the resolution to 1080p, then when playing a 4K movie it automatically switches to 2160p. However, when I use the "TV" mode to play an IPTV 1080p stream, the resolution won't change back to 1080p. It sticks to 2160p.

I have change refresh rate set to on stop/start (if this matters).

What am I missing?