MMR confusion

Hello, I am curious as to whether or not someone can help me understand mmr better because right now I am apparently in a rut according to op.gg.na. Not to long ago I fell into ELO hell, as it were (bronze 3 =/) from silver 3. It happened slowly but it happened. it was crazy but anyways, I climbed out in about a month back to silver 5. Once I hit silver 5 I hung out for a bit until about 2 weeks ago I began climbing quite well and started carrying games again fairly consistently. To add to that I started maining Ekko and went on a solid 30/12ish (have to double check I'm on my phone) run with him and a few support blitz, lee jungles and a few random games thrown in and I flew up to silver 2. Then I fell back to silver 3, won a game and went into promos, got a free win for it, failed promos, troll troll trynd bot int. Feeding ( the game should be present on my list for proof) went back then won 3 in a row tonight and am back in silver 2 promos with a free win. Op.gg for some reason hasn't updated beyond my blitz game a from yesterday. Anyway again, my question is what is the deal with my MMR? Op.gg is a rough estimate but it claimes I'm at 1050 which is like bronze 2 according to my research and I have by far leveled out my losing streaks from the past in the last week because I have had 4 consistent 5 game winning streaks and never more than a 2-3 game losing streak. I even had a 9 game win streak in the mix that wasn't followed by more than 1 loss. I understand it's preseason and the hole was dug 2 months ago but I am earning around 20-24 lp a game, losing 10-15, winning consistently, losing rarely and yet my MMR has me 400+ points under my rank? Why am I earning larger Lp than I am losing If the system believes I am that vastly over ranked?

PS. I took about a year off from the end of season 4 I was silver 1 and started playing again this late August. I was originally placed b4 in promos 3-7 but got up to s3 in about a week, even skipped a full tier 1 or 2 times in the process and then this all happened 5 weeks later in late October/November.