yeah, that happens by default if you tap a movement key twice in quick succession. I wouldn't turn it off though, rolling in combat gives you a defensive buff.
I must be hitting it twice, then. Either by accident, or, It's happening when I hit it twice when my toon is slow to react. I like the move, I just don't need to do it when I walk into the Admiral's office.
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Go to your options. Go to Controls. Scroll down to "Tap movement direction twice to roll." Set to "off."