Turn Signal Troubles

Ok I am going to try and explain this the best I can.
The right turn siganl works just fine, in the front and rear of car.

The trouble is with the left turn signal...
So here goes.

When the left turn signal is applyed both of the rear lights light up, like the flasher has been applyed, but the front turn signal works just fine. Now also when the breaks are applyed with the left turn signal on the front light turns brighter not sure what the back lights do and the left turn siganl stops flashing.

Please help.... I am not using left turn signal at all seeing the back is acting weird.

Thanks