Hello Lucas,
The STOP queues like MASS_CRM_BUPA* and R3AD_BUPA* you see in SMQ1 of ECC result from an initial load triggered on the CRM side.
Once the initial load finishes, these queue entries are automatically deleted from SMQ1 of ERP.
Reason: You don't want the delta changes to flow to CRM while initial load for an object is in process.
Regards
Rohit