Duplicate records in DevTools network when using Dio packkage

UPDATE:
It seems to be a bug in devtools. I opened an issue in DevTools github repo.

I use Dio package to send requests. It works well but when I monitor network traffic in DevTools network, it shows duplicate records (or maybe Dio sends each request multiple times!). Here is my Dio configurations:

static final Dio _dio = Dio()
    ..options.connectTimeout = 10000
    ..options.receiveTimeout = 5000
    ..options.receiveDataWhenStatusError = true
    ..httpClientAdapter
    ..options.contentType = 'application/json';

And this is what network tools shows: scrrenshot