Sonos 5.1 issues on Kodi

My Sonos app is showing that everything I play via my External HDD through my android TV is playing in Dolby Digital plus 2.0. I’m positive it used to play 5.1 with video that supported it and I have the speakers. I’ve enabled pass through on my TV and Kodi and checked a film on Netflix to see if it shows up as Atmos or 5.1 and it does. I played the same content in a different Sonos setup and It came up as Atmos. It has to be Kodi, I’ve recently started using the Arctic Zephyr skin if that causes any issues. Can anyone help?