Questions/Problems regarding modifications/styles need to be asked in the modification/style thread. That is where the support for modification/style is - not out here in the main forums. Please note that if a modification/style is unsupported (or even if it says it is supported), you may be on your own if you chose to install it.
The question isnt specific to that mod. Im just wondering what could cause 2 navtabs to be set as active at the same time.