Files coming out weird after transition?

[codingMASTER398]

Hello there!

Im having some trouble. When i open the file generated, its fine, but the next video in the sequence is super weird.

Any idea why the hell this is happening?

First video:

Second video:

Code:

const concat = require('ffmpeg-concat') const output='Final.mp4'

        async function oneTransitionMergeVideos(){
        await concat({
        output,
        videos,
        transition: {
            name:"fadegrayscale",
            duration: 500
        }
        })
        }

        oneTransitionMergeVideos()

Please help!!!