Slight delay on long press before Camera actually moves

Hi all, we have 2 sets of buttons in the app. Pressing one set will make camera move forward/backward and the other set makes the camera move up/down. We are using LeanTouch (http://carloswilkes.com/Documentation/LeanTouch) to manage touches.

The problem is when the forward/backward button is pressed, there is a noticeable delay before the camera moves forward/back. This issue however does not happen when pressing up/down button. I am wondering if its the way the offset is calculated. Here is the code below: