Images form Woocommerce not being regenerated

Hi there guys, as you can see in the attached link the product thumbnails are y default in 100×100 pixels (this fact make that the images are blurred in the online shop since they are really small for any screen).

I go to the image in the Media library > Regenerate thumbnail and I see this two lines:
– woocommerce_gallery_thumbnail: 100×100 píxeles (recorte exacto) ok-rsz_cenital-grey-1-100×100.jpg
– shop_thumbnail: 100×100 píxeles (recorte exacto) ok-rsz_cenital-grey-1-100×100.jpg

So, what I am seeing is that the default value for shop_thumbnail and woocommerce_gallery_thumbnail is 100x100px and I dont know how to change that value.

I have tried going to Personalize Theme > Woocommerce > > Product images and changing the value of Thumbnail image width to 300px. But for any reason this value is always 100x100px.

Could any one help with this issue?

Thanks beforehand and regards!

The page I need help with: [log in to see the link]