I'm not quite sure what you expect.

I'm not familiar with the A+.

Which gpios are you actually using? Is that photo a mirror image?

Gpios 0-8 have internal pull-ups to 3V3 of approximately 50k enabled at boot.

The other gpios on the expansion header have internal pull-downs to ground of approximately 50k enabled at boot.

Pins 3 and 5 have hard-wired 1k8 pull-ups to 3V3.

Anything under 1V at an input gpio may be seen as low (0). Anything over 2V at an input gpio may be seen as high (1).

I'm not quite sure what you expect.

I'm not familiar with the A+.

Which gpios are you actually using? Is that photo a mirror image?

Gpios 0-8 have internal pull-ups to 3V3 of approximately 50k enabled at boot.

The other gpios on the expansion header have internal pull-downs to ground of approximately 50k enabled at boot.

See http://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2835/BCM2835-ARM-Peripherals.pdf page 102.

Pins 3 and 5 have hard-wired 1k8 pull-ups to 3V3.

Anything under 1V at an input gpio may be seen as low (0). Anything over 2V at an input gpio may be seen as high (1).

See http://www.mosaic-industries.com/embedded-systems/microcontroller-projects/raspberry-pi/gpio-pin-electrical-specifications