Text links in pages with system path URL result in 404 errors

Issue Summary

Hi,

I enabled "Path" and assigned URL aliases to all my pages. Obviously now each page can be reached via system path (www.example.com/node/22) and alias (www.example.com/news).

The problem is that, on system path pages (/node/22), all internal links display a "node" part in the middle of the destination link - which then results in 404: http://www.example.com/node/casehistory.

I would not mind personally, but Google seems to be discovering system paths - although they're not in my sitemap.xml nor in text links - and it's giving me a lot of Not found errors.

Has anybody come across this issue before? Thank you.