Why is the red diode in my RGB led burning out?
The current through the red LED will be higher than the others due to it's lower voltage. However given a 5V supply it should still only be about 10ma which is well within the ratings given on the LED datasheet.

So either you got a crap batch of LEDs or you have something else wrong in your circuit. Some possibilities I would consider.


Your voltage regulator is not actually operating correctly due to missing ground connection, missing capacitors or some other issue.
Your resistors are not the values you think they are. In my experiance resistor color codes are all too easy to misread and I would strongly suggest testing them with a multimeter. 


I would also suggest you post a full schematic of your circuit so we can see if there are any design errors.