Searching in cache data gives array first index 1

$this->getCachedCategories();
//Above code Stores the data in cache for future use. So, it goes to the database only 
//one time and next time pick the data from cache. So far everything is good.

//I have a search criteria which is in the form of array. I filter above cache data based 
//upon the search criteria and gets the data.
foreach ($userInputsForFilter as $key => $value) {
    $this->Categories = $this->Categories->where($key, $value);
}

Here is the screenshot. If you notice the data retrieved has first index from 1 instead of 0. Actually the second record came up after cache data was filtered.

Can you please tell why this happens when searching the cache data? This not happening when going to the database.

Array to JSON Code

$CategoryResponse = $this->iCategory->All([], []);
return \Response::json($CategoryResponse, 200);

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