hitting laptop touchpad?
maybe crusty keyboard?
cerebral palsy?
Just tried Filter Keys (windows option/accessibility) and it still doesnt help. That's very weird. I though maybe smth with the game, nope - same in other.
It's not the keyboard.
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If I hold space on that test - it shows the same amount of clicks and "double" clicks, but Renpy games dont react to Space button hold. On the other hand it seems like some sort of glitch, when the game catch that small moment when I may hold the button a bit longer. It's so weird. Prolly gonna run virus scan, idk.
EDIT: I had to enable the Filter itself after enabled filtering method. "Ignore unintended keystrokes" works, but 0.3 sec is a bit much. Far from perfect solution.