Yes, you are getting either mechanical bounce or something like it. Increase your "debounce" values and/or your anti-mechanical debounce values. Change those settings on your board, and if that doesn't fix it set your activation point further back in the pull. That may be your problem in the first place. Your microswitch is too soon into your trigger pull!
http://www.boblongdirect.com/downloa...ompliant.p df