The problem analyzer will remove any horizontalAlignment component instance properties in Lightning Pages you attempt to deploy to orgs that don't support it.
What Triggers this Problem Analyzer?
If your deployment package contains the new instance property in Lightning pages called horizontalAlignment.
What problem is it solving?
This metadata type is not supported in any metadata API version below v58. Since v58 is not live, it is not able to be deployed as of yet. Therefore the deployment will fail if this metadata type is included.
How does it work?
Gearset will identify the horizontalAlignment metadata type and remove it from the deployment package.