Why Are My Forum Members Having To Sign In TWICE?

[BeePOD]

I am getting allot of messages from members saying they are having to input their email and passwords twice before being able to access the forum. Why is it doing that? Here is my forum if that helps;

http://bpods-forum.1064914.n5.nabble.com/

PLEASE FIX IT, THANKS...

[Peter <Nabble>]

Tell them to clean their cookies and it will be fixed.

Sorry for that.

[BeePOD]

Thank you Peter for your prompt reply I really appreciate that...