You're experiencing a continuous vaccine flow through the needle or a poor stream instead of a delivery of a sharp vaccine quantity.
Follow the next stages and find the reason for the issue-
Look for air bubbles in the vaccine tubes. If there are, you need to look where they are coming from:
Check the Spike connection and verify no leakage.
Check the connections between the vaccine tubes and the Control Units.
Look for a tube blockage.
Make sure you are using the proper Injection Head.
Use the recommended needle dimensions.
Verify proper vaccine temperature: 25°C–40°C / 77°F-104°F.
Turn off the system, take out the Injector and move its metal pin in and out a few times.
Replace the injector.