I do have exactly the same, and when i zoom in and change my Weapon it zooms out awkwardly and i am having trouble to zoom again..

I have found the source of the problem and a fix to it. The problem is that 'e' is set as the key-binding for helicopter fast forward, but this can't be found in the control menu at the moment. BIS please either remove 'e' as the default binding or add it to the control menu.

To fix:

1. Go to C:\Users\Yourname\Documents\Arma 3 Alpha - Other Profiles\YourProfileName and open the file called YourProfileName.Arma3AlphaProfile with notepad (Double click the file and choose 'select a program from the list' Then choose a word processor like notepad)
2. Press Control+F or scroll and find the line keyHeliFastForward[]={18};
3. Delete the '18' part or replace the line with this: keyHeliFastForward[]={};
4. Save file
5. Fly helicopters as normal!

See #0000727.