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There could be several reasons for the failure of Python Selenium to click on a button located at the upper left side of a webpage. Some of the common reasons are:

1. Incorrect element identifier: If the identifier used to locate the button is incorrect, Selenium may fail to find and click on it.

2. Timing issues: If the button is not loaded properly or takes time to load, Selenium may fail to find and click on it. In such cases, using explicit waits or modifying the implicit wait time may help.

3. Display issues: If the button is not visible on the webpage or is hidden behind other elements, Selenium may fail to find and click on it. Try scrolling the page to bring the button into view and then try clicking on it.

4. Browser compatibility issues: Some browsers may have compatibility issues with Selenium. Ensure that the browser being used is compatible with the version of Selenium being used.

5. Security restrictions: If the button is located within a frame or an iframe that has security restrictions, Selenium may fail to access it. In such cases, try switching to the frame or iframe before clicking on the button.