I did this but it didn’t work. However, I believe I have resolved the issue myself.
Go to your media folder in WordPress and click to edit an image. From there, if you look on the right-hand side, you have options to edit both the thumbnail and the main image, just the thumbnail, or just the main image.
Select the ‘thumbnail only’ and resize it appropriately to fit the same size requirements of the product carousel.
This appeared to work for me.
