I am getting confused

In my All Search area of the dashboard I have a search entry and it reports the stated path as the “From” page.

https://www.publictalksoftware.co.uk/support-forums-search-colorpicker

Yet when I click the link it 404s.

I did it manually and the link generated was:

https://www.publictalksoftware.co.uk/support-forums/search/color+picker/

See the differences in the URL?

https://www.publictalksoftware.co.uk/support-forums-search-colorpicker Bad
https://www.publictalksoftware.co.uk/support-forums/search/color+picker/ Good

Why is this happening?

I have had several links that just 404 when I click them.

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