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This is because I2C distinguishes between read (1) and write (0) using the least significant bit in the address. Which is also the reason why normally addresses are specified in 7bit, leaving out the LSB (so you need to shift it left one bit to get an 8bit address).
So on the bus, 0x26 is a write to device 0x13(7bit)/0x26(8bit), whereas 0x27 is a read from 0x13/0x26.