SCALE 24.04 + OpenZFS 2.2.x, which can rule out OpenZFS 2.3 and possibly even something (new) about the GUI dashboard with SCALE 24.10.
If the numbers in the command-line accurately display the correct capacity under SCALE 24.04, then it could in fact be how OpenZFS 2.3 (incorrectly) “calculates” the pool’s capacity. (It’d be interesting to see the GUI/dashboard reflect this as well.)
I’m also assuming you constructed your pool with all four RAIDZ1 vdevs at the time of creation.