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Well, this is peculiar… Does the gland nut loosen up allowing to needle to move about? Or, does the needle just get loose in the packing washers? Once the needle gets loose, can it be retightened by tightening the packing/gland nut again? Something isn’t right here for sure. The only other thing I can think of is excessive vibration, but it seems like other parts would be falling off as well before there is enough vibration to move those needles.
Does this issue occur on both high and low speed needles? For some reason is the packing nut bottoming out in the carb body before actually compressing the packing washers? You should be able to snug that packing nut down enough so you can’t even move the needles by hand…Are you using OEM packing washers along with the clear plastic washer that comes in the new carb kits?