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Strange 404 Errors In Logs

Hi all - I've noticed recently I've been getting a lot of strange 404 errors in my logs. A few examples:

PHP Code:
404 Page Not FoundApple-touch-iconpng/index
404 Page Not Found
404 Page Not Found
404 Page Not Found
404 Page Not Found

Some of them are things that exist (apple-touch-icon.png), but the 404 error has missing file extensions, and a "/index" after it. Some of them are files that don't even exist (404testpage4525d2fdc). I've run through the entire site looking for broken links, and there are none. I'm also not getting any 404 errors showing on the actual site - just in the logs.

My .htaccess file:

PHP Code:
RewriteEngine On
^(.*)$ index.php?/$[L

And my routes file:

PHP Code:
$route['default_controller'] = 'welcome';
$route['404_override'] = '';
$route['translate_uri_dashes'] = FALSE;
$route[LOGIN_PAGE] = 'users/login';
$route['landlords'] = 'listings/directory/1';
$route['complexes'] = 'listings/directory/2';
$route['managers'] = 'listings/directory/3';
$route['apartments/sublets'] = 'listings/index/13';
$route['apartments/roommates/19'] = 'listings/index/19';
$route['apartments/roommates/20'] = 'listings/index/20';
$route['apartments/roommates/21'] = 'listings/index/21';
$route['apartments/roommates/22'] = 'listings/index/22';
$route['apartments/roommates'] = 'listings/index/14';
$route['apartments/listings'] = 'listings/index/15';
$route['apartment-alerts'] = 'notification/add_notification';
$route['apartments/listings/([0-9]-(beds))'] = 'listings/index/$1'

Like I said, the site itself seems to be working fine, but I can't figure out what's causing these errors to show up in the logs. I've tried searching for answers, but they all seem to be dealing with 404 errors that are showing up on the site, and are actual resources that should be on the server. If it's just bots, is there anyway to stop these errors from clogging up my log files? Any help would be greatly appreciated!

Some phones will search the root directory of the web site if they cannot find the icons to display,
if they do not find them in the root then they will give you the 404 error.
What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

I looked into that, but it doesn't seem to be the issue - I've tried placing the icons in the root, but the errors continued to show up. Additionally, there's errors for pages that simply don't exist and are not linked to anywhere else in the site:

404 Page Not Found: 404javascriptjs/index
404 Page Not Found: 404testpage4525d2fdc/index

Could this be an issue with my routes?

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