Product when clicks goes to the wrong product and variant

-- HikaShop version -- : 3.4.1
-- Joomla version -- : 3.8.10
-- PHP version -- : 5.6.3
-- Browser(s) name and version -- : Chrome 67.0.3396.79 (Official Build) (64-bit)
-- Error-message(debug-mod must be tuned on) -- : No error message

Hi,

Not sure if this is related to my imports.
I created all my products using imports after exporting the first product with all 162 variants, be changing all the information and Id's

I have an UP and a DOWN product, in the category display for each they display the separate products fine.

When I select the UP and select a product it shows fine and the correct variants.

When I select the DOWN and all the down products show fine, but when I click on one it shows the corresponding UP variants, the correct colour but the wrong image, and I checked the product and the correct image is in the variant.

Don't understand what would cause this.

Thanks in advance
MSF