not all variants custom fields appear

-- HikaShop version -- : 3.1.1
-- Joomla version -- : 3.7.4
-- PHP version -- : 7.0.19
-- Browser(s) name and version -- : Chrome latest

Could you tell me if I do sth wrong: when I add variants for a product that has custom fields, in the variants not all custom fields appear. It's strange but only text custom fields appear in variants in front-end

I just want to keep product info the same for main product and variants, without any need to put the data once again for variants

Hey, sorry you had to wait.

I attach the screen of my fields in "product" table.

Yes, I have overrides created:
/html/com_hikashop/product/listing.php
/html/com_hikashop/product/carousel.php
/html/com_hikashop/product/show_tabular.php

I observed that values for variants are correctly inherited EXCEPT for check boxes which are blank. That's strange, please help.
I can give you password to my Joomla if that helps.

Here it is.

We have changed radio/checkbox fields to dropdown and now it works, but the problem in general still exists if we would like to use radio/checkbox.