BQ79600EVM: SPI mode does not work properly

I have been trying to collect voltage using BQ79600EVM and BQ79616EVM recently.

But when I use SPI mode for communication, the collected voltage jumps and is inaccurate on the GUI，when using UART for communication, this issue was not encountered, and the collected voltage was correct and stable.

Has anyone encountered a similar situation and answer the questions?

Thank you.