I was playing in the product page. Added a Collection list from categories because i wantetd to test something @RugbyWebDesign found. that it was not possible to show categories in the product page.
I did add a collection based on categories in the product page. Did some testing that was not working
The last i did was to set categories name EQ to a value. Then i did delete the collection.
Now nothing was showed on the product page except for the product that contained the values from my deleted setting in the deleted collection.
Tried to reload the project but i hade to read a backup made earlier