The slipper part of the clutch works anytime the rear wheel speed is greater than the engine speed. The slipper acts just as if you were pulling in the lever and releasing it to grab.
This can happen at upshifts if you completely chop the throttle letting the RPM drop way down. try keeping your RPM up when shifting. I would consider taking it apart and inspecting all the sliding surfaces and bearings. It sounds like it has a little delay ramping back closed.
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