If I have an image that I've clicked on to enlarge in the image search results, clicking outside of it often reloads the search page. This seems to happen mostly when the tab has been inactive for a while. I haven't monitored my search usage but I'd imagine this is counting as another search, potentially using up Starter plan user's search allowance.
Closing the enlarged image should simply close the image and return to the image search results without reloading the results.