Caching problem on index?

[solidsteak]

Hi,

 

I'm using a simple if statement in the template to detect if mobile using $mobile_device assigned in FrontController.

{if $mobile_device}
  A
{else}
  B
{/if}

Something very strange happens. The variable seems to change back and forth regardless of device at each upload of the file I'm using it in. So if I upload initially, it will display 'A'. If I make no changes and update the file on the server, it will display 'B'. Do it again, and it goes back to 'A'.

 

And if I include {debug}, everything works perfectly. Mobile shows 'A' always, and everything else 'B'.

 

What is happening here? I'm assuming something to do with the cache. I'm using the variable in a module tpl (homeslider), would that be the issue?

Edited March 29, 2017 by solidsteak (see edit history)