4th brightness step and later results in maximum brightness

I'm having a weird phenomenon where the lowest level to the 3rd section on the brightness bar level results in a gradual increase in brightness, but pushing onto the 4th lowest level immediately causes it to fully brighten my display.

Up until yesterday night, this was not happening at all, and I can't find any recent posts on the subreddit which seem to refer to a related occurrence - As of now, I've tried using a pre built version of SSDT-PNLF to see if the one I compiled was the culprit, but that didn't change anything, so I'm wondering if anyone has encountered this issue before and maybe has a fix for it

(For reference this is on a HP EliteBook 840 G7 running Sonoma 14.5, with a Comet Lake i7-10610U and just the built in UHD 620 iGPU)

submitted by /u/Thisisauser6443
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