Spi clocks are 4, 5, 6 instead of 8 bits

[dorong]

Hi all
I am using the stm32h743 device when using spi 6 to transmit data the clocks
are 4, 5, 6 randomly instead of 8 bits
when configuring spi2 the processor function perfectly.
on this device I have already used 
connection: SPI1, SPI5, ethernet, uart4.uart7,uart8, usart1,usart2,usart3
middleware and software package: freertos, LWIP
Timers: Timer1
System core: DMA, GPIO,NVIC, RCC, SYS
CubeMx Version 6.13
CubeIDE 1.16.0
Repository: 1.12.0

Thank you for you answer

[dorong]

I have checked all 6 SPI to be  configured as transmits master only 8 bit frame prescaler 256
only spi 6 behave sending 4 or 5 or 6 clocks instead of 8