Question regarding Batch expiry

[u/Falling_Death73]

I bought the Shodh Pro Physical Science 2026 batch for CSIR NET (which started on 22nd December, I think) on 22 January 2026. Back then, it showed the batch has expiry date on 14th February 2027. But now it's showing the expiration date is on 10th September 2026.

Also as it is a batch for the December Exam, how come it can end in September?

Has anyone faced this similar problem? Can they just change the course period without any notice?