Figured out the problem...I should be ashamed but since you guys were racking your brains trying to help me out, I would have done you guys a disservice if I remained silent...
the way I placed my rear stand is the culprit....to be specific, the two rubber supports holding my bike upright, well one of them is contacting one of the bolts on the rear sprocket whilst I'm rotating it.
here's a pic....
so ashamed...
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