Problem of lowering altitude when switching to vtol

Hi, my delta quad is experiencing a low altitude problem when transitioning intermittently.
When you check the log, the advanced setpoint is marked as 0.
Although I suspect CG. Iā€™m not sure.
How can I solve this?

https://review.px4.io/plot_app?log=2572d282-1b13-4666-88bd-d33893fda64a