[ Bug Report ] the video does not synchronize with sound when i merge with multiple videos

Version

ffmpeg v4.2
editly v0.11.1@latests
systemn window10

Steps to reproduce

    await editly({
      defaults: {
        transition: null,
        layer: { fontPath: fontPath }
      },
      width: config.videoConfig.short.width,
      height: config.videoConfig.short.height,
      outPath: this.output,
      // here is multiple video clips
      clips,
      outputVolume: 0.5,
      loopAudio: true,
      keepSourceAudio: true,
      fast: false
    }).catch(console.error);

the clips kind of like below

  this.data.map((post, index) => {
      clips.push({
        duration: parseInt(post.duration),
        layers: [
          {
            left: 0,
            top: 0,
            width: 1,
            height: 1,
            type: "video",
            path: post.originalPath,
            resizeMode: ""
          }
        ]
      });

      clips.push({
        duration: 1,
        layers: [
          {
            left: 0,
            top: 0,
            width: 1,
            height: 1,
            type: "video",
            path: bPath,
            resizeMode: "cover"
          }
        ]
      });
    });

What is expected?

videos synchronize with sound, even with multiple videos.

What is actually happening?

the video does not synchronize with sound when i merge with multiple videos

Start by reproducing the supplied editly configuration with multiple video clips using ffmpeg 4.2 and editly v0.11.1. Compare the resulting audio and video timing across clip boundaries; the issue is done when merged videos remain synchronized with their sound.