How do I make sure I don’t “lose my mix” when mixing in mono?

Hey there! I’ve gotten some amazing advice from this subreddit about using reference tracks and occasionally checking my track in mono when mixing. I decided to use a track (Two Bad by 2hollis) in a similar vein as the song I’m mixing.

I noticed that when I switch my track to mono it loses SO much content. When I switch the reference track to mono it holds up very well and doesn’t lose much info. Why is this?

Is there a way I can prevent this from happening? What could be happening in my mix that’s making it weak to the mono test?

For the additional context I’m using the metric a/b plugin in ableton to switch the tracks back and forth to mono and back to stereo.

Any help would be greatly appreciated. Thank you!!!