Thread:Project:Support desk/Coding in wiki links/reply

URLs and page names are UTF8 encoded, but you posted an anchor to a section of your page, which needs a different encoding system, since it matches an ID, and IDs use a limited subset of allowed characters.

If you want to use a link to a specific section of one page in various places you can create a redirect page to that section and link to the redirect instead, so you don't have to write that ugly code.