Why is it that sometimes if I make multiple posts in the same forum within a short time (seems like 30 seconds to 1 minute), those posts all end up in a single post separated by this?

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I mean, if I make separate posts, then I want those to be separate posts, not grouped together. The grouping together makes it less readable and more difficult to reply to. Is there a compelling reason for the forum software to do that? Is there any way to change it?