Your Salesforce lead's attribute "Method of distribution" contains empty value. During the salesforce -> marketo sync, the value is overwritten with null(empty) value. Please do check in Salesforce lead value.
Yes, you're just restating the issue, though. That does not solve the problem. We know it's pushing a null value back into Marketo - but the value had been "Mixed" in Salesforce before it was cleared.
In other words, the Salesforce value should NOT be null. It's clearing the value that was entered during the Sync for some reason. But we don't have any triggers to clear the value in Salesforce, so we don't know why that is happening. Could it be an issue with the permissions, that doesn't allow Marketo to permanently write the value in Salesforce? And if not, why would they all change back at the same time?
Hi Taylor - wondering if you found a solution to this problem. I'm running into the same thing.