They tried to deceive us.
After learning that we pay in cash, the waiter drew an 8 in the receipt instead of 3. And when asked to call the receptionist, the waiter called his colleague, hoping that we would not understand what was what. We did not escalate the situation further, given that we spent a lot of time on recalculations. As a result, they just brought us a new receipt, referring to the fact that allegedly the machine had printed it badly for the first time, although it was clearly visible that it was hand-drawn in blue ink.
The waiter tried to cheat and corrected the figure in the bill with a pen (thereby increasing the bill by 500 rubles). The administrator didn't care, even when we showed him this, most likely they had a well-established deception scheme. The food was very mediocre for that amount. I highly recommend it.