
When you say individual ones, how many? Also, what vaccine manufacturer, as they are both different. My vet uses the one that produces 70% of the UK vaccine. However, there was recently a problem with supply. He immediately stockpiled the other manufacturers vaccine, and the regime was different. Happened to me because I kept a pup back for myself too.
The main one gives a jab with a 2 week interval before the second. Then another 2 weeks before pup can go outside.
I had my pup vaccinated - with a 3 week interval. Then on my second visit, she had 2 jabs. Was able to go out after one week.
I'm guessing that your puppy buyer uses a vet with a different vaccine than the one you're used to. So, no problem with her vet, just a different make of vaccine. Hope that explains things.