We picked up a problem with our blog today where when selecting a month from our Archive drop down (on the right side column), no matter which month you selected, it was redirecting back to the home page of our site.
It turned out that the problem was actually with the Yoast SEO Plugin configuration.
If you are having this problem then go into your Yoast SEO Search Appearance configuration page:
Then select the Archives tab from the top menu:
Then within the Archives tab, scroll down to the Date archives settings:
Then ensure that it is Enabled.
You should then reload your blog and test the Archive drop down option. You should find that it is now working.
We would love to hear from you if this helped you out, or if you have any questions. Feel free to drop us a message below using our comments section and we will get back to you as soon as can.