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SPIS data shifting

I am testing SPIS to transmit mass of data(255 bytes each call) from nrf5 DK.

I found SPIS data shifting randomly.

The testing data is 0x88 but sometimes can get 0x44.

Below is correct logs.

This is the wrong wave.

When I turn on the Log, SPIS data is always correct, randomly got 0x44 when RTT log is off.

I make sure "USE_DMA_ISSUE_WORKAROUND" is ON and csn_event_handler() is entering.

Anything else I can fix or workaround this issue?