Wrong page being cached while using WP Super Cache

WP Super cache is showing a wrong page. Not all the pages are wrong. I have noticed some pages to periodically show a wrong page. It might just be possible that others are also showing wrong pages and i just haven’t noticed them.

1 specific page which shows a wrong one is http://www.couponminister.in/coupon-tag/hp-jabong-offer/

Also, when i apply delete expired, things seem to correct themselves. Please let me know how do i sort out the problem

“Expired files are files older than 3600 seconds. They are still used by the plugin and are deleted periodically”

http://wordpress.org/extend/plugins/wp-super-cache/

Best regards,
vikram
http://www.couponminister.in