HlsDownloader - the downloaded bytes size is different during multiple downloads of the same file

I am using HlsDownloader for download hls file, but detected that file has not been downloaded completly(not all the time), howewer i see that callback returns 100% dowloaded status. When I do not pass the executors into constructor of HlsDownloader then it is ok, file donwloading completly, but when I am passing the Executors for speed up the download then I see that some times file doesnt download completly.
Here is code snippet how I use HlsDownloader:
```
val hlsDownloader = HlsDownloader(
media,
cacheFactory,
Executors.newFixedThreadPool(6)
)
```