Why does Pytrends return significantly different data compared with the output from manual CSV download from Google Trends

I have written to download search interest for a number of topics in the travel & leisure space.

I have pasted some of the data query below with the freebase mid IDs

{
"dfUSAairlines": {
    "kw_list": [
        "/m/01515d",
        "/m/0k9ts",
        "/m/07y2s",
        "/m/0z07",
        "/m/0gztl"
    ],
    "geo": "US"

Below is the search term for the second freebase ID from the above code. The search term is for Delta Air Lines