We've found solution for the problem. The theme which is used on Shahab store has own partial view with code responsible for social buttons appearance. He just replaced this code by code from AddThis and it's working properly now.
Careful addthis.com has no instagram service. Unbelievable. It's actually nowhere integrated, also not in V4.0 NOP source. Why ? It's the most common tool beside facebook and will run over it.