301 Redirects not working

Hi everyone.
Many thanks in advance for any help.

I client I have had an old website and when I built the new one he requested to build it in another server. When I finished it I pointed the domain to the new server address and installed the 301 Redirects. I followed the 301 Redirects instructions and redirected all of his old addresses to new ones, but for some reason they’re not working at all.

Here are some examples:
OLD: https://dencofuses.com//distributors.php/
NEW: https://dencofuses.com/contact/
OLD: https://dencofuses.com/rfq.php/
NEW: https://dencofuses.com/contact/
OLD: https://dencofuses.com/docs/denco-fuses-intro.pdf/
NEW: https://dencofuses.com/docs/denco-fuses-intro.pdf/
OLD: https://dencofuses.com/euro-fuses.php/
NEW: https://dencofuses.com/products/

and many more.
I’m not an expert in WordPress and appreciated any help

thanks,
Marcus

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