I bought all of my ETH years ago, yet the bulk (67%) isn't supposed to mature until late this year (according to the ASSET MATURITY feature). I did not buy ETH last year, and there are also no such trades in my transactions. What I did do a lot last year is use my existing ETH to buy smaller altcoins. I don't see how that could be misinterpreted as making large ETH purchases. - The same goes for SOL. I've owned several SOL for years, yet not a single SOL shows up as long term...
I FOUND THE ANSWER TO THIS PROBLEM. SEE COMMENT BELOW.