SFDC Sync Not Always Assigning Salesforce Partner
Hello, everyone!
I'm currently working through an issue where our Marketo flow appears to be built accurately, and all data is available from the Lead via a web form, but the syncing action isn't always assigning a Salesforce partner to the Lead (I'd say this is happening to about 25% of our incoming Leads). This is resulting in our team needing to manually go into Marketo to sync the Lead to the appropriate Salesforce partner. I've made some very minor adjustments to the Smart List and the Flow, but the problem seems to persist. I've attached some screenshots below - maybe someone can see the issue?

NOTE: We use the "Person is Created / Source Type is not Salesforce" rule in the Smart List because we initially imported leads directly into Salesforce when we got started with Marketo.

NOTE: I redacted our Salesforce "User's" names for their privacy. What isn't shown in the screenshot above is that there are a total of 8 choices and one default choice.
Am I missing something in my setup? Do I need to rearrange any of the actions in the Flow to achieve better results? Any help here would be GREATLY appreciated!
Thanks.