Post title links to other post

Hi,

I’ve just noticed that clicking on a post title on my home page sometimes loads a different post – with the correct URL in the navbar (that belongs to the post I wanted to read.) The categories are always correct.

My permalink structure looks like this:
homepage/categoryname/posttitle

In settings I have the following setup:
/%category%/%postname%/

I don’t use any plugin that messes with permalinks, although I recall playing around with one a while ago. My htaccess is untouched.

My query on my homepage looks correct. It is really weird. I click on it, and an other post shows from that category, while the URL belongs to the intended post.

Has anybody experienced something like this?