Hello @trailcampro,
You can manage the image size for the Catalog Images By going to Admin Panel > WooCommerce > Settings > Products > Display > Catalog Images . No matter whatever the image size you have uploaded here you can define the size for the image to display.
Also please try regenerating your thumbnails with the help of plugin while switching the theme like : https://wordpress.org/plugins/regenerate-thumbnails/ and see if it resolves the issue.
If the above approach does not resolve the issue, please share with us your website URL so that we could inspect the website for the issue and provide a precise fix.
Hope this Helps,
Best Regards!!