Round to nearest 5 doesn’t work

Hello on the page above I have the settings like these:

https://ibb.co/dsZ104H

Which I expect should round the numbers to the closest number that is dividable by 5

https://ibb.co/brwRRwB

I also checked in the product that no manual price is set

https://ibb.co/BCdVdjn

Please help.

Kind Regards
Julian

The page I need help with: [log in to see the link]