I just noticed this too. I'm just barely going to qualify for plat this year so every EQM counts for me and I have it all planned out. I just did a PHX-DEN round trip and something looked off. Fortunately, I have about a 40 EQM buffer.
Now, even if I'm not using stickers to upgrade, I look at the upgrade area of the website for my domestic flights because it shows the distance in the place where it says how many 500-mile stickers you need.