I have created an operation in Jitterbit to run an upsert on two custom objects and one standard object: Lead, Project_c and ProjectLead_c
The ProjectLead object is just a junction object that relates the other two. Everything runs properly, data upserts and objects are related but in my log files there are a handful of external ID's that receive a duplicate error. When I query for those external ID's they are not found. There are other ID's that also get the duplicate error but those ID's are found in salesforce.
Does anyone know why this could be happening ? I have disabled duplicate rules already but no luck