Question to anybody use (Opmex) Mobile Theme

Hi,
I ask support few times to "http://opcrat.com/omtex/support" but no answer at all.
Here is my problem.
Ever since I install these extension, my home page and products page working wrong sometimes.
Which I see the mobile theme at PC and PC theme at mobile.
When it happen I clear the caches (about couple of times a day) and my site works OK (PC for PC theme, Mobile for Mobile themes).
v 1.5.6
use mobile --opmex for i phone
omtex-tablet--for tablet.

I am very appreciate for reply if anybody have similar problem and know how to fix this.
Thank you