I just set up some basic scoring in Marketo and noticed that SFDC is changing my behavior score back to "0" during the sync process. I believe this is because of how I have the fields configured/mapped but not sure how to best troubleshoot. Here is a screenshot of what I see in salesforce. As you can see below, the score changes in marketo and then SFDC reduces the score back to 0.
The standard lead score field appears to be still maintaining the total score (23) but the behavior specific score is going back to 0. I assume it's because this is a custom field I created and maybe I set-it up wrong.