Downloading datasets with --unzip flag results in duplicated files

I was downloading the following dataset: https://www.kaggle.com/ramirobentes/flights-in-brazil.

By running:
```
mkdir -p data/flights-in-brazil
kaggle d download -p data/flights-in-brazil/ --unzip amirobentes/flights-in-brazil
```
The final result is:
```
$ tree
.
├── data
│   └── flights-in-brazil
│   ├── BrFlights2
│   │   └── BrFlights2.csv
│   └── BrFlights2.csv
```
Both files have the same md5sum indicating that they are actually the same file. Is this expected? Shouldn't just one of them be present?