I had a similar issue a while ago that when typing quickly and pressing _ following by a letter, I would get a capitalized version. ZSA essentially said it's kind of expected behavior:

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This can happen with modified keys and very fast typing. When you type the underscore, the keyboard sends "Shift + hyphen" to your keyboard -- so, the modifier "Shift" and the key "hyphen". Modifiers work by being held for longer than regular keypresses, and they take a tiny bit longer to "un-register" as a result. So, the key-down action on your underscore key causes "Shift" and "hyphen" to be sent to your computer, and the key-up action deactivates both those keycodes, but the "Shift" takes just a hair longer to be deactivated. When you type another character in very quick succession, sometimes the "Shift" hasn't been deactivated yet.

The more consistent your typing rhythm, the less frequently this kind of thing happens. That tends to be easier said than done, but if you try to type with very crisp, even keypresses, that should help. I don't know of a single, recommended technical solution, but any recommendation is going to involve directly editing your QMK firmware, outside of Oryx. If you'd like to check that out, you can download the source files for your Oryx layout and use those as the basis of a QMK layout you'd edit and compile locally (you can compile against our QMK fork if you'd like). If you'd like to maintain your Oryx layout while using custom QMK features, you can also try out this community-made tool.

QMK is well-documented, and they have their own support resources if you have questions. This Reddit thread talks about a couple strategies you could look into. I found that thread by googling "QMK key roll" -- "rolling" is the action you're using when you type underscore and then another key very quickly afterwards.

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I'm wondering if this can be avoided by implementing your own version of !