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Duplicate values in one tab while navigating to various tabs in a tabpanel

I have a tabpanel with 8-10 tabs and each tab has a form. I enter certain values in form of 1st tab and click save. In between the process, it shows action support "saving....". In this meantime, I click on several tabs in the tabpanel and after few seconds, I am forced to the original tab. Now whe nI click save again, the same record is duplicated and saved in that tab.

For data display in the tabs, wrapper classes are used. Please can anybody explain why this could be happening??