Java Batch upload via uploadSessionAppendV2

I am trying to batch upload multiple files via uploadSessionAppendV2, but somehow all the files are written to a single file.

Lets say i have two identical files file1.txt, file2.txt , each with size 2575.

Here is my code

List<UploadSessionFinishArg> entries = new ArrayList<>();
String sessionId = null;
long offset = 0;

// upload and get session id for first file
File file = new File("file1.txt");
InputStream in = new FileInputStream("file1.txt");
String sessionId =  getCleint().files().uploadSessionStart().uploadAndFinish(in).getSessionId();
offset =  file.length(); // 2575
UploadSessionCursor cursor = new UploadSessionCursor(sessionId,  offset);
CommitInfo commitInfo = new CommitInfo("/uploads/file1.txt", WriteMode.OVERWRITE, false, new Date(), false);
UploadSessionFinishArg arg = new UploadSessionFinishArg(cursor, commitInfo);

// second file
file = new File("file1.txt");
try (InputStream in = new FileInputStream("file2.txt")) {
    boolean close = true;
    getCleint().files().uploadSessionAppendV2(cursor, close).uploadAndFinish(in);
    offset += file.length(); //5150
    cursor = new UploadSessionCursor(sessionId,  offset);

    CommitInfo commitInfo = new CommitInfo("/uploads/file2.txt", WriteMode.OVERWRITE, false, new Date(), false);
    UploadSessionFinishArg arg = new UploadSessionFinishArg(cursor, commitInfo);
    entries.add(arg);

} catch (Exception e) {
    e.printStackTrace();
}


//now batch commit 
LaunchEmptyResult result = getCleint().files().uploadSessionFinishBatch(entries);

while ( getCleint().files().uploadSessionFinishBatchCheck(result.getAsyncJobIdValue()).isInProgress()) {
    try {
        Thread.sleep(1000);
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

UploadSessionFinishBatchJobStatus status = getCleint(). files().uploadSessionFinishBatchCheck(result.getAsyncJobIdValue());
System.out.println(status.toString());

The problem is, all the data from both files is commited to /uploads/file2.txt, and file1.txt is not created at all.

This is the response i get, correct_offset":5150 for the first file, which is confusing.

{
    ".tag": "complete",
    "entries": [{
        ".tag": "failure",
        "failure": {
            ".tag": "lookup_failed",
            "lookup_failed": {
                ".tag": "incorrect_offset",
                "correct_offset": 5150
            }
        }
    }, {
        ".tag": "success",
        ".tag": "file",
        "name": "file2.txt",
        "id": "id:amNxvd7HFlAAAAAAAAAAvA",
        "client_modified": "2017-01-13T23:56:11Z",
        "server_modified": "2017-01-13T23:56:11Z",
        "rev": "1695120345e",
        "size": 5150,
        "path_lower": "/uploads/file2.txt",
        "path_display": "/uploads/file2.txt"
    }]
}