Welcome Kalkkis!
Thanks!
Weapon accuracy shows -10? when it should presumably show +10 for size.
The -10 you see listed out by the weapon when firing is not size-related, but appears because you have some system corruption, which can reduce your accuracy. This is also why it has a '?' beside it, because it may not actually take effect (only a chance, but it's there to remind you of that possibility). Any modifiers listed beside weapons in targeting mode are weapon-specific, so you won't see anything related to the target there.
So that was what was going on. I though that ? signified "unknown" when it signifies "random". Good that things are working like they should be.
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