Why are GitHub Code Search results inconsistent between the website and the API?

I’m experiencing inconsistencies between GitHub’s website and the GitHub API when performing the same code search.

For example, when I use the following query:

q=%5C"X%2B%2B%5C"+%5C"%2B%2BX%5C"+language%3Acpp+OR+language%3Ajava+OR+language%3Ago+OR+language%3Apython

• GitHub Website: shows 3.6k results

  • https://github.com/search?q=%5C%22X%2B%2B%5C%22+%5C%22%2B%2BX%5C%22+language%3Acpp+OR+language%3Ajava+OR+language%3Ago+OR+language%3Apython&type=code

• GitHub API: returns only 1 result

  • https://api.github.com/search/code?q=%5C"X%2B%2B%5C"+%5C"%2B%2BX%5C"+language%3Acpp+OR+language%3Ajava+OR+language%3Ago+OR+language%3Apython