plz help file cut error

[soohyu0101]

First of all, I apologize for the lack of English.
If you use the cut function, you cannot cut the desired part.

Can be cut at regular intervals

But music and voice files
You can cut the section you want

But the video clip
1 second, 5 seconds, 10 seconds, 15 seconds,
It is possible to cut only at this interval.

What I have found so far
Not a snap function.
Even if you use the indicator cut function, about 0.5 seconds of the front part will be cut.

What I've done so far is reboot, reset., new project, new sequence. different video files, update, downgrade, downgrade to 2019. I've done everything
If you know, please help.

I can't cut where I want
But music files are possible
Only the video file is cut in a strange location