Layout load in mobile mode from desk/lap top

Ever so often when a page loads, the mobile and/or iphone version loads while I'm on a regular computer. I have no idea how often this happens with regular users.

If I had to guess what the culprit would be, I would guess it is related to one of the optimization extensions I'm using.

Specific files (css, js) can be excluded from the extension. What file(s) related to the template should be excluded, so that this does not happen, or is there some other suggestion which may help.

Thanks

The browser detection is in file gk.template.helper.php in template/libs directory.