I changed the order of the data, sorted it by ID from smallest to largest, input it into the model after the same preprocessing, and got a completely different fitting result from before sorting. Why?

```
fit_m01_1 <- stan(file=paste0(getwd(),'/stan_model/m01_RW.stan'), data=data_list,
pars = pars_m01_1,
chains = 3,
iter = 4000,
warmup = 2000,
thin = 1,
control = list(adapt_delta = 0.95,
stepsize = 1,
max_treedepth = 10))
```