@peter_savi My check was done on the homepage where you’re displaying a collection list of blog posts.
Your issue appears on the lab detail page Where are you are using a reverse reference to blog items. I suspect the issue lies in the reverse reference of blog > labs.
You could test this out by adding a multi-reference field to the labs collection that points to blog posts, and then using that relationship for the collection list on the labs page. If the results are different, then we have isolated the issue.
I personally have not done a reverse relationship from a collection item, but this raised my suspicion.