What is the difference, or why are two styles used: "JA Ego - Home 3" and "JA Ego - Default / Home 3"?
Hi Joohmla
Each style will use a different layout (see in 'Layout Settings')
You can see the sample in our demo site:
Home 3: https://ja-ego.demo.joomlart.com/index.php/pet-home Default / Home 3: https://ja-ego.demo.joomlart.com/index.php/our-services-pet
These styles are just names, you can rename as you wish.
Regards