@julen-phts: Hello there,
1. The photo metadata should automatically show up if you uploaded the picture you have clicked from your mobile phone or camera. Have you uploaded all the photos that have been clicked by a mobile phone or camera or have you downloaded some?
2. You seem to figured out the WooCommerce Issue. Haven’t you? Let me know if you still have any related issues.
3. Have you made any changes to the slider as the slider on you site is different from what It look like in the demo.
About the gallery images losing quality on light-box as compared to the full size image, I don’t think much can be done about it as you have smaller image in the light-box so the pixel gets compressed as a result the quality doesn’t look as good as the full size image.
Let me know if this helps you out!
Kind Regards,
Skandha