This means your theme has serious issues. From what you all are saying and what I see that there is something that got automatically updated I believe and your template returns to its previouse demo state cutting off everything. This mean the theme looses all design and settings so it is not good anymore, its obsolete, because even if this fixed manually, brought all settings to as it was, as the backup is not hitting up for some reason, this will happens on the next update with something that is inompatible and you have no idea what is it.
This will effect many business as the shop is not in working state and i need to place it under maintenance mode right away as now its a third day and no ones can do anything about it not even bother to reply…