I2C Communication Signal Issue
I'm not familiar with the Kinetic MCU, but on a different MCU I have had the same waveform when I misconfigured the SDA line as a regular output instead of configuring it as an open-drain output.

You can see that the slave is responding with an ACK and trying to drive SDA low but something (probably the Kinetic as I2C master) is driving SDA high thus you see the voltage at 1/2 the rail during bit 9.

Set SDA as open drain.