Are you running a single nodebb process or multiple?
Sounds like something is interfering with the cold load of the topic(aka when you press f5). You will have to do some debugging and see what is happening in the topic controller. This is the function that handles loading a topic so put some console.logs in there all the way to res.render() and see if they are all triggered. If they are all triggered then you need to check in src/middleware/render.js the res.render
function is there and it’s responsible for rendering the html and sending it back to the browser.
Rebuild and restart after activating a plugin.