Problem in using checkpoints -different datasets start with different epoch value

Sir, I am training the pre-trained model on my own data. I am facing problem in using checkpoints. For different data, epochs start with different no.

example- for a small data set 30 wav files (each of 7-8 secs long) divided in 70-20-10 ratio across train-dev-test folders, it resumes from epoch 10276

Use standard file utilities to get mtimes.
I STARTING Optimization
I Training epoch 10276…

but a larger data with 180 wav (each of 10 secs length), the epoch starts from 1832

Use standard file utilities to get mtimes.
I STARTING Optimization
I Training epoch 1832…

we have tried for third datatasets and in this epoch starts from 45214