if you're not busy, can you try running this and let me know if it still does the input spam? its the HTML version but for desktop~ https://moonspod.itch.io/input-display-test/download/6I_NRUK0vGNkISB1_iW7R2UEy6Q...
aah i really dont know why this is happening, it sucks, try one last thing, grasping at straws, there is another download for an fps locked version https://moonspod.itch.io/input-display-test/download/VhOznDZIN3XO8bceLF47pSxPATd...
if this doesnt work, which i doubt it will, i wont be able to help sadly, sorry