That could be an indication of either the server failing to serve some site files (namely the styles/resources) or some malfunctioning caching being involved.
However, I notice that all your site resources get loaded from https://secureservercdn.net/160.153.137.210/2gx.a18.myftpupload.com/
instead of the site domain https://foreveragility.co.uk/
. Is this intended behaviour?