final cut pro strobing

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Did you RENDER the effects?

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AND, are you checking your video quality on an external video monitor?

[Johnalynn]

yes i RENDERED the effects and the monitor has the same results

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My next guess is the obvious:

First thing to always try is to Quit FCP, Restart the Mac, Open your FCP project and try again.

Next:
THE FOLLOWING COMES FROM THE KEN STONE WEBSITE:
“Over 5,000 years ago Confucius wrote: ‘If you are toiling away, you have changed nothing and FCP heads South on you, [starts behaving in strange ways] then it is time to trash your FCP Preferences.’ ”

Click the following link for instructions on how to do this.

https://www.kenstone.net/fcp_homepage/trashing_fcp_prefs.html

A great way to do this is to use “FCP Rescue” a free Apple Script that will Trash the Preferences for you (and restore nearly all of your user settings afterward).
There are versions for FCPro & FCExpress.

Download these free Apple Scripts at

https://fcprescue.andersholck.com/

[David Scott]

Hi
Another very obvious one. Is the image in your viewer or canvas window larger than the window? Try reducing the picture size to 25% to check.
Cheers
David Scott

[Scott]

Have you checked the field dom setting in sequence settings?