Popnet substeps 4 get strange result,help please!!

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Recently,I learn houdini to make lightning and sparks,when I simulate sparks particles with substeps 1,everthing is ok.But when I change substeps to 4.It's strange that particles appear where it shouldn't be.
Help me please,thanks a lot.

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1.png (618.4 KB)
2.png (327.1 KB)
lightning.hip (1.0 MB)

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lightning.hip is my practice file.Thanks anyone masters pass by.
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Oh,I finally figure out the issue,if I use “$FF”,I shouldn't use the popnet to play blast,I should use filecache node to play blast with int frame.
Image Not Found
If you want view the sime solution with deselect “integer frame value” set “step” to (1/substeps),then you shouldn't hit “play” button icon,you can only hit “left arrow” key on your keyboard.

note:there must be segment “$FF” in filecache node.

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