Unusual smell of her feet

Was with my friend yesterday we been out shopping most of the day we got back to her apartment we were about to mess around she took off her shoes and socks I was about to make my move to her feet. And I got a wiff of them usually they smell like the amazing vinegar smell with a very light cheese but not this time. I can’t really describe the smell but kinda like sawdust with a mildew more sawdust tho.

I’m curious has anyone else had a experience with that kind of smell of the feet