Hello,
I have test both countdown times, the one which we add with Wp-Bakery in WordPress pages, and the other one which we display in our product page by adding a sale price and set scheduled date.
The first one which I added with Countdown Timer theme element does not require starting date because it auto picks the site date from time zone selected in site settings.
Screenshot for clarification: https://jmp.sh/LpKfeTN
Result: https://jmp.sh/bvrlckW
The second one which I added in product page also working just fine you can check the screenshot.
Screenshot: https://jmp.sh/GY97Sbf
Result: https://jmp.sh/qHcs1j3
You can clearly check this in my screenshot that there is no such time difference.
Best Regards.