Site changed all of a sudden

theres one website I help manage, which all of a sudden changed its layout: The top header image went away, the menu disappeared, and the latest posts slider as well.

This is what it used to look like: https://web.archive.org/web/20140708002846/https://www.anf-powerlifting.org/

This is what it looks like now: https://www.anf-powerlifting.org
(I am recreating the menus, and uploaded the header image again)

What happened? Something changed in the last updates?