Why can't the camera get the right number of pictures matching the frequency?

Isaac Sim Version

[v] 4.5.0
4.2.0
4.1.0
4.0.0
4.5.0
2023.1.1
2023.1.0-hotfix.1
Other (please specify):

Operating System

[v] Ubuntu 22.04
Ubuntu 20.04
Windows 11
Windows 10
Other (please specify):

GPU Information

NVIDIA GeForce RTX 4070
NVIDIA-SMI 535.183.01

Topic Description

Detailed Description

The camera setting and other relative parameter as below:
cam_prim_world_r=“/World/Camera_right”
camera2 = Camera(
prim_path=cam_prim_world_r,
name=‘camera2_right’,
frequency=30,
resolution=(1280, 720), )

my_world.set_simulation_dt(1.0/60.0)
physics_dt: float = 1.0 / 60.0

But the number of picture is not right to match the frequency parameter.

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