Hello Rab,
I apologize for the late response. Our support was off because of the Diwali festival in India.
The live version of sellacious has Bootstrap compatible issues with other Joomla templates. However, we've fixed in the production version of sellacious. If you have any premium license of sellacious, let me know, and I'll send you the updated version of sellacious with many more exciting updates.
As to fix this issue, for now,
This is the path of the file for Product details page
../components/com_sellacious/layouts/views/product/default.php
This is the path of the file for Product List page
components/com_sellacious/layouts/views/products/default.php
You can email us at contact@sellacious.com
I hope this helps.
Thank You