It was the microformats2 feed on your homepage. It still showed content, but it's formatted a bit weird, showing multiple notes in one "post". Try it in the Monocle preview: https://monocle.p3k.io/preview?url=https%3A%2F%2Fcolinwalker.blog%2F

Currently the authorship on my notes points to the homepage, so the h-card there should have the info. It's not as common a setup, but see steps 5 and 7 in https://indieweb.org/authorship-spec#Algorithm