Saw Grinding Machines
You do not have a link list or collection with a handle set to saw-grinding-machines, or you do and it's empty.
Go ahead and create a link list called Saw Grinding Machines on your Navigation page and populate that link list with links that point to collections, to see collections listed here. Make sure the link list also has a handle set to saw-grinding-machines.
OR if you want this page to be display products, create a collection called Saw Grinding Machines.