Looking at your asset, it is a very large piece, which doesn’t scale well with distance fields. Distance Fields that are generated work best with smaller modular pieces to get the best results.
Sometimes using a higher distance field resolution (build settings in the static mesh editor) will help alleviate some of this by generating a high resolution distance field mesh for your asset.
When troubleshooting some of these issues it’s best to use the viewport view mode to see your distance fields by going to Show > Visualize > Mesh Distance Fields.
With your room that you mention you’re having issues with, is this a single mesh or very large mesh? If that’s the case it would be better to break the walls up into their own individual pieces and add some thickness to them, if not already. This will give the best results when creating meshes for distance field methods.
I hope this helps and feel free to ask any other related questions if you have any.
Tim