Yes, par for the course. Break-in varies by user. Compressing the arch can be part of that. Some people need to soften up the sole or upper. Should be all good in 4-8hours.
By the way, I don't think there's any leather on B6s.
Yonex E-Zone Xi100 - Tournagrip XL - Adidas Barricades - Nike Tennis Socks