What's the best method to showing meta tags on a user based website?

[man5]

Normally you would add unique meta tags(title, description) for each page of the website.  However, what if it's a user based website where a user can add posts with title and description? Is it better to add user's title/post name in the meta tags or keep it as your own?

[QuickOldCar]

Do as theirs, and if they never set theirs use yours.

[man5]

Yes that works.

 

Now here is a weird problem that just came up.  Say I have a page with 10 posts.  Each post has it's own page with their own meta title and description.  If i click on any one of the posts and go to their page; their relative meta tags should be indexed. However that's not the case. Meta tags of a different post are indexed instead. If it only when I refresh the page that the relative meta tags show up. 

 

This is not happening on any other sections of the website. Only with with those posts.  Can anyone tell me why this might be happening and how I can fix it?

[QuickOldCar]

Is it fetching the meta by something that has a unique value like an id?

 

Trying to add from an array a previous query and into a new loop?

 

Too hard to possibly know why unless see some sort of code, maybe even more questions.