So I searched a bit and this link has a few suggestions: https://www.blister-prevention.com/blogs/prevention/holes-in-the-back-of-my-shoes
TL;DR you can have a deformity on your feet called Haglunds which can worsen wear on the heel counter. There is also a possibility that you can relace your boots or use padding to reduce wear.
I love how that article had plenty of other explanations for why a person might wear out their heel counter, but you jumped straight to him having deformed feet lol.
So I searched a bit and this link has a few suggestions: https://www.blister-prevention.com/blogs/prevention/holes-in-the-back-of-my-shoes
TL;DR you can have a deformity on your feet called Haglunds which can worsen wear on the heel counter. There is also a possibility that you can relace your boots or use padding to reduce wear.
I love how that article had plenty of other explanations for why a person might wear out their heel counter, but you jumped straight to him having deformed feet lol.