Whit last one version of Discourse looks like there is an issue with height of posts in list of posts when there is lager amount of tags and multiple users.
As I can notice, if first post contains large amount of tags, then user list grows verticaly not horizontaly
You’re really pushing the limits with the number of tags used per topic as well as the length of each tag. It might make sense to check if all those tags are needed.
Regardless, I pushed small fix with some protection for topics with a lot of tags. If there’s not enough space, the tag container will now wrap.