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This also happened to me recently, perhaps with a recent plugin update?
I use Vertex, by Elegant Themes. Woke up one morning and first noticed that the homepage title was that of a blog post from over a year ago that had been published as a “sticky”. I removed the “sticky”, and now the home page of the website is the title of the most recent blog post.
The website is pharecircus.org
WordPress 4.7.3
VertexVersion: 1.8.7
Yoast version 4.6
SEO > Titles & Metas > Homepage tab
%%sitename%% %%page%% %%sep%% %%sitedesc%%