Upfront gives archive layout in stead of posts layout

I have a generic post layout, and that works correct with my page and custom posts. But since today it doesnt work with my posts. I get the archive information instead.

Page: http://herafinance.nl/over/
Custom post: http://herafinance.nl/activiteit/administratie-samen-uitvoeren/
Posts: http://herafinance.nl/margeregeling/ or http://herafinance.nl/verlegging-van-btw-bij-onderaanneming/