Higher LP Losses?

So, for starters, this isn't a rant. XD

I recently managed to FINALLY get myself out of Bronze V (after the roughest placements that I've ever had) and have noticed a change in my LP loss upon losing.

Back when I was still in Bronze V, I would only lose about 15 LP for a loss; sometimes up to 17, but nothing more than that.

However, ever since I hit Bronze IV, I've noticed that I've been losing 20-22 LP for losses. Is this a Bronze IV thing or did I miss something?

~ A very confused Bronze player

EDIT: Why did I get downvoted for asking a question about LP mechanics. o.O