Yeah, different GPs are getting through their list at different speeds depending on how many patients they have registered and how many of those are in each category. Smaller PCNs (a number of GP surgeries working together) in areas with a younger demographic are moving quicker than large PCNs in areas with higher percentage of older people living for example. Also depends on their ability to run regular vaccine clinics on top of all their other work, and vaccine supplies, etc. Medical records are also very patchy tbh, and all sorts of things will be at play with them, as well as the human variables such as where they're drawing the line for certain conditions.
On top of that some people are getting it through work, which can be confusing to some getting it through the GP route.
Short version is it doesn't really matter what exact order people get done it, just that they get done. I see it as a social duty to get the vaccine as soon as you're offered it.