All new right rear bulbs, all blink when blinker is on, what can i do to fix this?

There should two separate bulbs for marker and blinker. It sounds like a bulb is burnt out, bad ground, melted socket or a wiring anomaly. Are you certain it's supposed to have 57 series dual element bulbs for blinker and markers?

Just exchange the rear signal light bulb for a new one, that will fix the problem Ps, it will be wise to replace the one on the other side as these bulbs have a life expectancy, do them both at the ame time.

Your right rear turn signal bulb is blown.Replace the bulb and the fast blinking will stop.

Normally with the blinker blinking really fast, it's telling you that one of the bulb is blown, front or rear signals. Check your fuse, and fuse relay to see if it would fix the promblem

the fuse is broke

the bulb at the taillight has blown. Replace the bulb. The fast blink is the systems way of saying "Hey, we need a repair here!!"

when you use the right turn signal, does it blink faster?. Could it be the bulb holder is damaged or rusty?

It has a bad bulb. Find the bad bulb to fix this issue.

Usually a fast turn signal means that there is a light out. You should probably check all of your lights, including back-up lights, and turn signals. If there is one out then replacing the burnt out bulb should fix the problem.

Make sure bulb replaced is the required 2 way or 1 way. If you're sure you put in the right bulb type (1 way or 2 way) 6 or 12 volt.. bulb model marked on side for replacement (Check carefully). Assuming its the right bulb type and still blinks fast, you will have to replace the socket. Sockets do get corroded and worn. Disconnect the battery, cut positive then cut negative. Wire up new socket same way using wire connectors. Tape up connections after.
Should then work.
Make sure before you do this you have the right bulbs in all sockets (front and rear) and that all lights work 1st. One failing light front rear same side can cause this problem.
Go to a scapper to get a socket.. just cut it off a wreck... take a couple of them. There cheap.
Good luck