H1b 6 year term decreased after change of employer

At employer A, my h1b term was extended for 3 years and extension was given from 08/15/2021 t0 08/14/2024.

Now i changed jobs and employer B filed i129 petition for change of employer and new h1b term I got is from 06/22/2021 to 06/21/2024 where 06/22/2021 is the date when the change of employer petition was applied.

My question is, why was my h1b term lowered by 2 months? Is that a problem? Do i need to worry about anything?

H1B extension can’t be approved beyond a max of 3 years at a time from the start date on your petition, so you are good.