[BUG] Acquire target at Turret behavior

Link to .capx file (required!):

    https://dl.dropboxusercontent.com/u/68649813/turret_acquire_target_bug.capx

Steps to reproduce:

1. Open project

2. Run the project

3. Click on the green cube which is note the fired-on one(the bottom one).

Observed result:

Turrets keep targeting and firing on the top cube.

Expected result:

Turrets should fire on the clicked cube.

Browsers affected:

Chrome: yes

Firefox: yes

Internet Explorer: yes

Operating system & service pack:

Windows 7, Service Pack 1

Construct 2 version:

r139

Thanks, should be fixed in the next build.