HashMap<String, ArrayList> from CSV returns null for first node

I have been struggling all day with this seemlesly unimportant issue, but I need to get it sorted. I will post all my code and explain it. I need to parse a CSV into a HashMap with structure {key, value} where value is an ArrayList of ArrayLists of Strings.

HashMap<String, ArrayList<ArrayList<String>>>

In the back, using AsyncTask, I get the data correctly into the map using a CSV document where I have the information stored. Here is my AsyncTask, just in case, but I can 99% say it works just fine.

public class ReadAllPaths extends AsyncTask<Integer, Double, HashMap<String, ArrayList<ArrayList<String>>>> {

public interface AsyncResponse {
    void processFinish(HashMap<String, ArrayList<ArrayList<String>>> output);
}

public static final String TAG = "ReadAllPaths";
public AsyncResponse delegate;
@SuppressLint("StaticFieldLeak")
private final Context context;

public ReadAllPaths(Context context, AsyncResponse delegate) {
    this.context = context;
    this.delegate = delegate;
}

@Override
protected HashMap<String, ArrayList<ArrayList<String>>> doInBackground(Integer... allPaths) {
    return readData(allPaths[0]);
}

@Override
protected void onProgressUpdate(Double... progress) {
    DecimalFormat df = new DecimalFormat();
    df.setMaximumFractionDigits(2);
}

@Override
protected void onPostExecute(HashMap<String, ArrayList<ArrayList<String>>> result) {
    delegate.processFinish(result);
}

private HashMap<String, ArrayList<ArrayList<String>>> readData(int allPaths) {
    InputStream is = context.getResources().openRawResource(allPaths);
    BufferedReader reader = new BufferedReader(
            new InputStreamReader(is, StandardCharsets.UTF_8));
    String line = "";

    HashMap<String, ArrayList<ArrayList<String>>> all_paths = new HashMap<>();
    ArrayList<ArrayList<String>> value_date;

    try {
        while ((line = reader.readLine()) != null) {
            if (isCancelled()) break;

            value_date = new ArrayList<>();

            // Split the line into different tokens
            String[] tokens = line.split(";");

            String key_date = tokens[0];
            value_date.add(new ArrayList<>(Arrays.asList(tokens[1].split("\\s*,\\s*"))));
            value_date.add(new ArrayList<>(Arrays.asList(tokens[2].split("\\s*,\\s*"))));
            value_date.add(new ArrayList<>(Arrays.asList(tokens[3].split("\\s*,\\s*"))));

            all_paths.put(key_date, value_date);
        }

    } catch (IOException e) {
        Log.d(TAG, "Error " + line, e);
        e.printStackTrace();
        return null;
    }

    return all_paths;
}
}

In my main Activity I make a call to it and its onPostExecute method. Again, posting it just in case,

ReadAllPaths readAllPaths = (ReadAllPaths) new ReadAllPaths(this, output -> {
        // Here you will receive the result fired from async class
        // of onPostExecute(result) method.
        Log.d(TAG, "processFinish: Process finished!");
        everyPath = output;
        Log.d(TAG, "onCreate: output: " + output);

    }).execute(R.raw.all_paths);

What is strange is wat happens now. I can make a log.d, or print or whatever and print my output, and it will print my data perfectly. On the next stage, I need to "dynamically" access the map, so I use this simple function (level is just a avlue from 0 to 2):

private ArrayList<String> getPath(String date, int level) {
    // Example of structure
    // {"19-05-2022": [[path1], [path2], [path3]}]}
    return everyPath.get(date).get(level);
}

Now this works perfeclty everytime except for the first element in my CSV. I know maps don't have an order, so I tried changing my CSV and the exception keeps occurring on the first line of my CSV though it is correctly displayed when I do my log.d. Also I have tried checking if key exists via:

everyPath.containsKey(date);

And also returns false only on the first row of my CSV. At first I thought this could be due to dealing with headers in the CSV, but again, the data is correctly displayed when I print the output of my AsyncTask. Only the part where I need to fetch the data is not working. Also I found a way around, which is duplicating my first row of the CSV, but I would rather understand what is going on here. Thank you!