Self url not set correctly?

[tonzyl]

I’m getting behaviour from the Websub/Pubsubhubbub plugin I don’t understand. When I check websub.rocks to test my site (https://zylstra.org/blog) it erroneously says https://zylstra.org/blog/blog is the ‘self’ url, with double ‘/blog’. If you try to subscribe using a feedreader that checks for websub, logfiles show that it finds the proper feed url (/blog/feed) first but then says ‘canonical url moved to /blog/blog/feed’ and tries to subscribe to that.

[tonzyl]

(maybe as additional info: my blog's url (/blog) is different from the WP folder (/wp).