The links and refresh problems

Dear Friends,
I have a problems in my JSP code. In an session, I read a set of data into a Vector, display it by a table. The two JSP pages (A and B pages) are linked each other.
If I load B page through A page (link) it is fine, but if I reload A pape through B page, all of data display in a table is displaced twice. For example,
original in A page
1 a
2 b
3 c
will be changed into
1 a
2 b
3 c
1 a
2 b
3 c
However if I manually refreshed it, the A page will correctly display again.
I am very confused. I removed all of elements from the vector. I can not find any reason on it.
Any person can give me some hints? Thank you very much.
Daan

Somewhere you are doing an add to the vector without first clearing it somewhere...

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