I had a similar issue with "ant", except it was horizontal and the game refused to acknowledge I had found it. I'm wondering if it only registers the ones that it initially generates and doesn't double check when you select others or something. I did notice when you move it, it updated the list to reflect that there were two aardvark's so I'm not sure why it didn't recognize the 'ant' that I located.

Thanks for this! It was a tricky one to solve, but finding an "accidental" match now grants a point.

Ha. I read this comment and found the exact same diagonal "Ape"