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Is the merge occurring in Marketo or SFDC?
I suspect SFDC is doing this and the Master record has blank values and they are getting pushed back to Marketo. If you cannot determine this with your SFDC Admin, call Support.
well the thing is, before I was blocking the change from a salesforce sync, which is why I don't think it is SFDC. Support told me to modify my field block settings, so I did this but no change.
I have the exact same settings for the "lead source" field and have had no problem with that field. :/
I think that the issue lies with the fact that the leads which the values seem to be overwritten are being added to SFDC from an API as CONTACTS and then synced into Marketo and using a webhook to call the marketo token and associate it to the lead record. This is the time where I notice that I'm losing data. If the lead is synced into SFDC from Marketo as a lead, then it's no problem. Assuming this is the issue, would any one happen to know WHY Marketo would just overwrite that field value to NULL, and if there is a way to fix it? I've also tried to build a new Marketo custom field that does not sync into SFDC at any point, thinking that maybe it was the sync issue, but I have had no luck with that either. Values are still being overwritten.