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BQ27510-G3: delay after start bit in I2C

Part Number: BQ27510-G3
Other Parts Discussed in Thread: BQ27510

Im using the ev board of the fuel gauge - bq27510 and communicating with Nucleo 

I'm encountering a delay of 6.5-5.5ms between the first start bit sent to the fuel gauge and the address+w that fallows.

attached is an example: 

this behavior is consistent:

is this behavior normal? is there an explanation for this delay? (as it does not appear after every start bit in the I2C)

thnx