In my own writing, I usually try to be very consistent, unless I am intentionally trying to make a joke or keep things light. And in those cases, I am very deliberate in my use of mixing the styles.
But in reading someone else do this, I didn’t even notice.
I suspect to emphasize enumeration so readers don’t incorrectly parse the sentence. But the text would be even clearer had these speech patterns been omitted altogether.
Not in this thread yet, not talking down to you, apologies if tone comes across that way: jokes aside, noticed you're OP, and I'm very curious what the intent was here.