data of fstorage written data and reading back are not the same

I use nrf_fstorage_write() to write data to fstorage. And then I use nrf_fstorage_read() to read data. But data of fstorage written data and reading back are not the same.

Data written log messages is as follows.

0> <debug> app: addr=0x7D000, wlen=24
 0>
 0> <debug> app: pData w
 0>
 0> <debug> app: pData[0]=0xDE
 0>
 0> <debug> app: pData[1]=0xDD
 0>
 0> <debug> app: pData[2]=0x0
 0>
 0> <debug> app: pData[3]=0x0
 0>
 0> <debug> app: pData[4]=0x0
 0>
 0> <debug> app: pData[5]=0x0
 0>
 0> <debug> app: pData[6]=0x0
 0>
 0> <debug> app: pData[7]=0x0
 0>
 0> <debug> app: pData[8]=0x0
 0>
 0> <debug> app: pData[9]=0x0
 0>
 0> <debug> app: pData[10]=0x0
 0>
 0> <debug> app: pData[11]=0x0
 0>
 0> <debug> app: pData[12]=0x0
 0>
 0> <debug> app: pData[13]=0x0
 0>
 0> <debug> app: pData[14]=0x0
 0>
 0> <debug> app: pData[15]=0x0
 0>
 0> <debug> app: pData[16]=0x0
 0>
 0> <debug> app: pData[17]=0x0
 0>
 0> <debug> app: pData[18]=0x0
 0>
 0> <debug> app: pData[19]=0x0
 0>
 0> <debug> app: pData[20]=0x0
 0>
 0> <debug> app: pData[21]=0x0
 0>
 0> <debug> app: pData[22]=0x0
 0>
 0> <debug> app: pData[23]=0x0

Data reading log messages is as follows.

0> <debug> app: addr=0x7D000, len=24
 0>
 0> <debug> app: data r
 0>
 0> <debug> app: pData[0]=0x1C
 0>
 0> <debug> app: pData[1]=0x8A
 0>
 0> <debug> app: pData[2]=0x0
 0>
 0> <debug> app: pData[3]=0x20
 0>
 0> <debug> app: pData[4]=0xE9
 0>
 0> <debug> app: pData[5]=0xFF
 0>
 0> <debug> app: pData[6]=0xFF
 0>
 0> <debug> app: pData[7]=0xFF
 0>
 0> <debug> app: pData[8]=0x98
 0>
 0> <debug> app: pData[9]=0x2
 0>
 0> <debug> app: pData[10]=0x0
 0>
 0> <debug> app: pData[11]=0x0
 0>
 0> <debug> app: pData[12]=0x61
 0>
 0> <debug> app: pData[13]=0xD0
 0>
 0> <debug> app: pData[14]=0xB
 0>
 0> <debug> app: pData[15]=0xA
 0>
 0> <debug> app: pData[16]=0x0
 0>
 0> <debug> app: pData[17]=0x40
 0>
 0> <debug> app: pData[18]=0x0
 0>
 0> <debug> app: pData[19]=0x40
 0>
 0> <debug> app: pData[20]=0x4D
 0>
 0> <debug> app: pData[21]=0x2A
 0>
 0> <debug> app: pData[22]=0x3
 0>
 0> <debug> app: pData[23]=0x0
 0>

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