Why am I losing more LP on losses than I'm gaining on wins right now?

So some information: I'm a top main who's currently Gold 2 right now. I've been steadily climbing this season, starting about Silver 2 or 3 I believe, I don't remember exactly, but it was Silver for sure. Now, I'm even starting to get consistently matched with and against Platinum players which, unless I'm missing something, would lead me to believe my MMR believe I'm improving and somewhat reaching Plat levels? Correct me if I'm wrong. But lately, the LP gains versus losses feel kinda unfair. I'm getting like 15 LP consistently for winning games, sometimes 16 or 17 if I'm lucky enough. But just last game, I lost 19 LP on a loss. And my LP losses are almost always higher than my gains if they're not even. I actually stopped playing for the day seeing that -19 LP because it's incredibly frustrating that my wins are getting me so little and my losses are costing me so much.
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