I had to replace my rear turn signals because I broke one but now all 4 flash at the same time (hazard lights / 4 way blinkers)
The indicator in the speedo doesn't flash. It used to always flash both, although the blinkers worked correctly.
I'm unsure what exactly I could have messed up unless I caused a short or something. I put the green wires to the wire with the stripe, although it shouldn't matter.
Maybe the bulb type is causing a problem (pulling too much juice or maybe too high resistance so it looks like a blown bulb?)