LSM6DSOW I3C IBI interrupt

I test the LSM6DSOW I3C IBI interrupt, I set the accelerometer FIFO mode, and FIFO full, the interrupt is triggered, and I got payload from LSM6DSOW. What does this mean?

i:0,read value:0x1

i:1,read value:0x20

i:2,read value:0x5

i:3,read value:0x0

i:4,read value:0x0

i:5,read value:0x0

i:6,read value:0x0

i:7,read value:0x0

i:8,read value:0x0