By design:
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" Feel at the lever would make Goldilocks proud, not too baggy, nor too snappy, in fact just right, but there's no return spring which might be a problem for those that prefer gritty cables."
"I like these levers, please note, they do not have a return spring... thus the 4 stars. Also, people are telling me these are the same as the 500's but just with fancy graphics. But I like fancy graphics, so that's cool. But really Sram, why not add a return spring??"
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"The S500 features a composite body with adjustable-reach aluminum levers.
These don't have a return spring so you'll need to get creative if you only run a front brake and don't want the unused lever rattling around. You can do it!"