I'm not sure if this is related to IB, since these options are so illiquid that no one trades them (or because no one trades them). So what do you expect other brokers to do with options that no one trades and therefore you cannot know how other brokers may show P&L for them?
IB (and other brokers) may not be able to determine what those prices may be.
Even nearer-term 3-month CL options have huge price discrepancies all over the place on the options chain:
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While for those 1-year illiquid options I can set any bid & ask prices I want (personally as a retail trader) and mine will be the only prices you may see and my bids will determine what's on your P&L. While there is no arb opportunities on options that no one trades.
I don't know what may happen at other brokers, but no one has experience with illiquid options that almost no one trades.
All options guides, books, trainers, etc - advise not to trade illiquid options. When you do, you're the only one trading them and therefore you're on your own.
Though in your case, I don't think there is a big cause for concern yet, because you should be able to get in & out near reasonable price or generally an average mid-price between similar options, because some market makers will pick your orders. You may just lose a lot on slippage.
IV is solved by price; hence "implied."
They marked you to the 4.00 offer. That's why you don't short naked vol in commodity vol. "If there is no spread... there is no trade."
"How can you sell the puts if you haven't bought the call!" Pink Floyd, "The Wall"
I mean if they would sold me out at 12, I would have 40.000$ loss not 15k one..