Hi Paul,
"The first wright I2C command will not deliver a acknowledge, only when first there is a 'read device' executed then the first write I2C command will deliver a acknowledge."
Do you mean if the first action you do is write, then there is not ack signial?
I try to dupicate your issue, here below is my result, you could see each ack as the marked note in blue.
if any questions, please kindly let me know.
Best Regards,
RomanWang