so don’t know who needs to see this, but i use WK on two different computers (desktop and laptop), and i guess i never bothered looking how to sync tampermonkey across the two devices (despite being logged into the same chrome profile and having everything else sync, tampermonkey does not). thus i had two piles of minorly different extensions. except on my laptop, double check actually worked and on my desktop it did not.
so i took a few minutes and manually matched up the list and even order of scripts on both computers. after all was said and done, i found three differences in regards to different script versions.
i tried the easiest first: i updated ConfusionGuesser which was outdated on my desktop to the current version (1.21). and voila! double-check randomly worked on my desktop. i’m very happy now.
again, everyone has their own pile of script goop, but this is what worked for me, maybe it’ll work for others.
tl;dr: i updated a separate extension (ConfusionGuesser) to the current version and double-check started to work again