Darkle the filename changes every time you enable/disable an extension or clear the cache. Normally Flarum should delete the old files, but sometimes filesystem permission issues could prevent Flarum from deleting the files.
You can delete all js, js.map and css files as well as rev-manifest.json, and Flarum will generate the required files again on next request.
Or you can look inside rev-manifest.json and you will see the names of the files that are currently used, and delete the others.
Don't delete the images or folders though!
