Two Installations, one hosting account, odd links

Hello!

I have two WP installations on one webhosting account – one is based in the root of said account and one is based in a subfolder.

The one based in root (https://www.strawdonkey.net) appears to work fine, but the one based in the subfolder (https://www.leekandpotatoes.co.uk), erm, doesn’t – well, not strictly anyway.

I can navigate around said blog with no problem, but some of the links – category filters, for instance – change the URL to https://www.strawdonkey.net/leek/blahblah as opposed to https://www.leekandpotatoes.co.uk/blahblah like it should be.

What baffles me is that the Home, Archives and Comments links all work as they are supposed to, linking to https://www.leekandpotatoes.co.uk/etc!

I have set the Blog Address value (in the Options tab in the Dashboard) to https://www.leekandpotatoes.co.uk, and the WordPress Address to https://www.strawdonkey.net/leek. Every time I try and put the trailing / on to either URL, WordPress removes it automatically when I click Update Options, so I am presuming that is not the problem.

I’m probably doing something wrong though – can somebody point me in the right direction as to what it is?

Many thanks!