“Post query order by: random” bug with the “load more” function

Hello. There is a bug with the load more function when the post query order by is set to "random". When one hits the load more button for a certain type of posts, let say posts in category X, the load more function will load posts from category Z, Y, and Q as well as repeating posts that have already been loaded.
If I did not make myself clear, just let me know. Would be nice if you could fix this error!