Content

For some strange reason, whenever my client goes into the WP site to edit the content, the whole content area in terms of table layout etc messes up – even if they’ve only gone in to add a tag to an image or change an image or word: https://www.letprotector.co.uk

Ive been told that this site needs validating as there are loads of errors and issue with the site – could this be the reason why the editing of content messes up or something else?