Maybe intended behavior?
Multiple precision hits on a single enemy(without killing it) do get your stacks up to 10 but further precision hits do not refresh it. At 10 stacks the only way to refresh the timer is to either kill an enemy or use your dodge.
In summary you cannot refresh your timer by getting precision hits AFTER u hit 10 stacks.
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Yeah I noticed this happening, really frustrating. Hope they fix this and reduce the time it takes to get stacks. Takes wayyyyy to long to get the cure going for PvE.