Weight Issues - Why Are These Lambs Not As Heavy?

In this video we weight lambs to see how they are growing and to gather data for performance recording. The lambs also get a worm dose and their second Heptovac P vaccination.
A weight discrepancy shows up between two different mobs of lambs...
Am I too late with the worm dose?
Working solo today as Robbie is away on a well deserved holiday. Thankfully, the Cotter Crate is in action to cut the workload.
Link to Cotter Crate video as mentioned:
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Thanks for watching,
David.