updates not showing up on IE and firefox

i am facing very strange problem
i have a website which i recently moved to https : https://indiagetseverythingfree.org/

problem is that all the coupons do not show up on home page when i open my website on IE or firefox
however, everything is fine n chrome
if i open coupon link directly in IE or firefox, it opens but does not appear on home page.
also the tiimestamp of coupons is incorrect and it seems time has stopped for IE and firefox

IE and firefox show my last coupon was uploaded 11 minutes ago
they were saying same thing 10 hours ago
and dont show new coupons
seems time stopped for them at 16 aug 12.16 pm IST