Hi,
To show/hide the NEW badge, this property below is taken into consideration in the category page:
This date is then compared with the "time_frame" (1 week, 2 weeks or 1 months) which can be altered via "Flexible VM3 Template" plugin.. If {today_date} minues {created_on} is less than {time_frame}; then the NEW badge appears. The idea is pretty straight forward.
{created_on} is a valid Virtuemart property (it is not a function or property we have invented) It grabs "created_on" data from the database (under
#__virtuemart_products table)
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I suppose; somehow, the Sync plugin you use mess up the {created_on} column in the database, which causes failure on displaying NEW badge properly.
You may try to contact with the real developer of the Sync Plugin; or you can purchase a "Premium Support Service" via:
www.flexiblewebdesign.com/premium-support and let us fix that issue or find an alternative way to display NEW badge properly.
Regards.