author.php template not updating in ‘pretty’ URL

The other day, I set up an author.php template in my modified version of the default theme. I have my .htaccess file modified to permit “pretty URLs”, and when I first set up author.php, I was able to reach it by the https://…../baseurl/author/username format, as well as other formats (eg, /?author_name=username).

Today I made several adjustments to the author.php template, but they are not reflected when I use the pretty URL format, though I can see that the template is in place and working, because the changes are reflected when I use the /?author_name=username string format.

This leads me to believe that whatever process (?) enables the pretty URLs has cached or otherwise held onto the old author.php template code, even though the code from a few days ago no longer exists in any file on the whole server. Have others encountered this? Is there a cache I need to clear or something?

TIA,
pr0