"Page not found" on mobile, works on desktop

[johnywhy]

A page works perfectly on desktop browser, but gives "Page not found" on mobile device. 

What might cause that?

https://bayviewboom.org/protolabs-r2

thx!

[Carlos]

I get "page not found" on desktop too.
Are you sure the page exists?

[datiswous]

the page https://bayviewboom.org/protolabs-r2 redirects to https://bayviewboom.org/404 , while the page https://bayviewboom.org/protolabs-r3 just gives a 404 error without redirecting to https://bayviewboom.org/404