If I want to make two separate posts one after another, it never happens - my posts always get merged into one? Does anyone know why this happens and how can I avoid it?

That happens to me, too. You should wait a couple of minutes before adding another post. It worked for me.

Hope this helps.

OK, thank you. Hopefully, someone will tell us the exact time of waiting.

Hey Sylph. It's a flood control feature that prevents people from spamming in the same thread. If someone responds to your post, you can immediately reply, however if you're responding to your own post, you must wait 10 minutes.

Thank you, Ryan Chandler. It's good to know.