And VBulletin 4.2.x at that. This version hasn't received support in years and also only runs on a long since EOL'd version of PHP.
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As you can tell from the forums and how preorders work, web design is Square's passion.
This is a commonly used, cheap forum skin. I've played other games going back nearly twenty years that use the exact same setup.
It also it takes like 3 days to load your profile. Please fix.
Sometimes threads are really slow, especially in the sub-forums, and it's easy to forget about them a couple of days later. And even in busy threads. It's not about 'collecting updoots', but in fact to keep track if somebody actually replied to you and keep the flow of the conversation after intervals. In a thread like the Healer Strike, that gains multiple pages overnight, it's hard to keep getting back to replies and then not even guaranteed that the person you replied to will see that. And it happens because a thread's narrative is hardly linear, with different niches of conversation going at once, sometimes meaningless things about people just arguing about arguing.
Threads you've replied to are marked with a little clock icon. If it's in a sub forum it should be even easier to find since they move down the page much more slowly.
Your problem is solved entirely by just reading the thread. If you can't be bothered to read what other people have to say then you're not really interested in participating in the discussion.
I assume you skew pretty young because for many years every forum on the internet was exactly like this one and it was fine. It's not a big deal.