i have a new corsair K70 rgb keyboard and it double types letters.
mine seems to be cc and s   wich is in all of my passwords and logins
i am not correcting thhe  typos in this to show problems
any help out there.

Did you download the software and make sure the firmware is up to date? In the program, you SHOULD be able to change the "Repeat rate" of keys so that it takes longer before it starts repeating a key when you hold it. You might be pressing the key a tad longer than you want to be, causing it to start the repeat process.

what I would try like above Seth said mine don't double type at all could be faulty would rma if program don't fix good luck this is my second one 1st one didn't either I dropped it though

I've got a K95 and no issues.   
 
The older boards were known for some double strike issues, but I though Corsair had gotten that sorted out.   I would contact Corsair.  They're usually not too bad to work with in regards to returns.

I've had zero issues with my K70. Like others said I would contact Corsair first.

No issues with my Strafe rgb.