[Droid X] Keyboard doing double-input of letters and sometimes short words

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While I'm typing, if I type fast I get a LOT of doubles, llike this oror even like tthis, ifif the word is sshort enough. It's really REALLY starting to bother me, as I'm sure you can imagine. I've tried Better Keyboard 8, Gingerbread Keyboard, and the default Android keyboard, and they're all doing this. I've tried clearing all their caches and data, and it's still persisting. I flashed over the most current version of Android, 4.5.602, with the newest version of MIUI, 1.10.21, so everything SHOULD be working correctly...anyone know what causes the issue or how to fix it?