Thanks Caleb, It is actually theme which is creating problem. When I changed theme to WordPress Twenty Sixteen all the products were displaying correctly.
I think I need to update the theme.
Let me check if I can go with present theme.
Thanks again.
Thanks for Reply Mike. They are actually assigned to those categories. There are only three categories and all three categories do not have any parent. I uploaded the products using CSV import suite and I can see the products under books category but not under remaining two. Even if I click on All(126) products it is just showing 66 products which are under books category.
Frontend shop page it is working fine and I can see all the products under all the categories. Backend those products are disappeared.
Regarding conflict with another plugin I have only these active plugins.
Contact Form 7
Regenerate Thumbnails
Relevanssi
SendinBlue Subscribe Form
Slider Revolution
The Events Calendar
W3 Total Cache
Woocommerce
Wp google map
WPBakery Visual Composer
Thanks