Sharing Button appends appname.glideapp.io instead of custom domain

I’m not experiencing the same thing. For me the share action only shares the column value and nothing else. I tried sharing to gmail, sms and a note taking app. All of them only shared what I intended to share. My guess would be that the sharing sheet on the device you are using does that by default and it’s not tied to Glide. I use Android. Have you tried other devices, like IOS and Android. Have you tried sharing from other non-glide apps to see how they react when sharing content through the share sheet?