I tried to read chunk by chunk and upload to remote server. but the final one seems exceed the file size

I'm using "read-chunk": "^3.2.0", because new version doesn't support require for which My project has to use it

firstChunk result {"d":{"StartUpload":"5242880"}}
uploading continue chunks 5242880 10485760 51387344

...
other chun result {"d":{"ContinueUpload":"47185920"}}
finished uplading... 47185920 52428800 51387344

   const stats = fs.statSync(path);
    const fileSizeInBytes = stats.size;
    console.log('fileSizeInBytes', fileSizeInBytes)

    for (offset = 0; offset < fileSizeInBytes; offset += chunkSize) {
        const chunk = await ReadChunk(path, offset, chunkSize);

        if (firstChunk) {
            console.log('uploading firstChunk', path, offset, offset + chunkSize, fileSizeInBytes)
       
        } else if (offset >= fileSizeInBytes - chunkSize) {
            console.log('finished uplading...', offset, offset + chunkSize, fileSizeInBytes)
        

        } else {
            console.log('uploading continue chunks', offset, offset + chunkSize, fileSizeInBytes)
    }