Is the Lead Score field blocked from updates by SFDC by default, even though in the admin section is says "Block updates from: None"? A few of my reps made some changes to lead scores in SFDC, but after the sync Marketo changed them back.
I know this can be prevented by using the "Add to campaign" feature in MSI so that reps can run the leads through a score-changing Marketo campaign, but is that the only way? I don't see reps acutally doing that.