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[Urgent] Page trigger interaction not smooth when scroll back and appear the starting screen for 1 second

In “Service & Products” section of my site, I used “Page trigger - While page is scrolling” to do with the 4 features :

1 second of bug appear when I read thru these 4 features and scroll back, the bug seems like showing the “feature 1” starting screen for 1 second.
(It is smooth when scrolling down to view more.)

Can any one know how to fix it? Many thanks! (Very urgent…)

Here is my site Read-Only:

Attached the timeline of this interaction for preview :