Sampling Rate and data points collected per second


Hi, I using MUSE Headband 2016 with default sampling frequency 256Hz. The problem I am facing is about data points collected per seconds. As per the sampling frequency it has to be 256 samples per second but the device is sending around 300 data samples per second.
Can anyone explain why this is happening, Please. I am expecting to get data samples as per the set sampling frequency


The Muse data is transmitted in bursts due to how bluetooth works. On average it’s 256Hz though.