Hello,
First of all thanks for choosing our Theme, we are glad to be you in the WoodMart WordPress family :-)
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I visited the URL you provided.
You don’t need to use any third party plugin to add the color swatches on the product grids.
You can add them using WooCommerce.
First you need to Go to Products >> Attributes >> Configure Items and you need to set the option as in the screenshot.
Screenshot for Clarification: https://ibb.co/n6mS5qW
Then you need to Go to Theme Settings >> Shop >> Attributes and Swatches and select the attribute to be displayed on the product grid.
Screenshot for Clarification: https://ibb.co/Ks9P3Wr
You can also read our detailed documentation in the following link:
https://xtemos.com/docs/woodmart/variable-products-swatches/
And for the products displaying only one which module you are using to display products on the page please provide a screenshot to check it myself and help you out accordingly.
Best Regards.