Why isn't the sampling performed at equal time intervals?

I noticed that the data displayed for the Scalar ALU is not sampled at equal time intervals. Why is this the case? How can I achieve equal-interval sampling? <img width="1271" height="548" alt="Image" src="https://github.com/user-attachments/assets/6f26b68a-82cb-4348-b4ed-a070006aa09e" />