My turn signal light went out, so I replaced it with the 2nd bulb I had (from the last time it went out)

At first there was still not success. I noticed a nick in the wire so we patched that up. The bulb works again but now flashes twice as fast. The rear blinker is still fine. The flashing is fast in both the dashboard indicator and the actual light. Hazard lights function fine. When turn on my parking and/or headlights the driver-side blinker turns on, but is dim. This shows on the dashboard and on the actual light.

So the bulb is new, hazard lights work, all blinkers are fine. Driver-side front turn signal blinks fast. Turning on headlights manually causes the drivers side turn signal to stay on, but is only half as bright.

Fuse, relay, wiring, etc? Where to start, and has anyone here had the same issue?