Tier 1 Ent. Partner(Spouse) visa period.

Hello,
Thank you for your all information..

Finally, I got Tier 1 Ent. Visa (Entry clearance)
I am leaving to UK soon..

But I have a question.

I applied with my wife at the same time OUTSIDE the UK.
However, the visa period is different between me and my wife.
My period is 3 years and 4 months but My wife's period is ONLY 3 years....

It is correct?
And Please any one.. Let me know why it is different.
Do I have to send email for This error?

Thank you..

It is correct.
First of all your spouse was given a PBS dependant visa (NOT a partner or spouse visa which is a different visa under the UK immigration system). Main PBS migrants are issued entry clearance (outside the UK) for 3 years and 4 months, however the PBS dependant visa is issued only for 3 years.