I noticed today I've received nearly 10x the average amount of points I get per day.
See:
https://www.boincstats.com/stats/-5/user/detail/76980179455/charts

The points system doesn't work very well.
Like, I use a lot of GPUs on a day, and the points rise by only little.
Another day in the week, I only use 2 or 3 GPUs, and the points remain low...

Edit: Seems like the Collatz Conjecture is responsible for it

Yes. there are some projects (which shall remain nameless) which give away points like candy - completely disregarding the formal definition of a Cobblestone (see section labelled Claimed and granted credit). That horse bolted a long time ago.

More significantly, points are not awarded immediately upon the return of completed work. Sometimes they are, but at most projects you have to wait for 'validation' - where your work is compared for accuracy against another user. If you're unlucky, this can take weeks, or even months.

I think you may be right about that.
There are still many pending tasks.