Does anyone have the problem, or ideas on how to solve 2 balls not getting stuck in the intake while intaking it?
Don’t have the balls touch each other while in the intake. The surface on the balls is very grippy (thanks Vex! It would be much more difficult to work with smooth game elements) and generate friction. If you still have the issue, increase the torque will help.
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Can you post a picture of your robot?
I see that you have
those parts. Make sure that the robot is driving straight towards the balls. You might also want to increase the torque of the intake.
If you have a rubber ban spinner as an intake, I would use more rubber bands and spin the intake the opposite way to unstuck.
In this image, I am pointing at the rubber band at the base of the intake because it is unneeded and could cause friction or get the balls stuck. A way to counteract this or intaking the 2 balls is by adding standoffs on your base of your intake pointing outward; away from the robot
Here is another image and I can see that this wall for the intake should be supported a bit more. Something our team did to have this wall, with good support, was adding 2 beams across the intake wall on the inside to make sure the balls didn’t get stuck on the rubber bands or anything else that could happen.
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Thanks, We tried removing the bottom rubberband in photo 1,but without out it the ball does not go up the ramp. I’m not sure the rubberband wall not being supported well enough is an issue, as when holding the walls, the same problem still happends.
We have tried removing those parts before, and the problem still occurs. Those parts are to make sure the ball goes up the intake towards the middle, as without it, the ball often gets stuck on the sprockets.
If there is too much friction on the balls, they might take a while to get through there, or it could even stop completely. Try adjusting your flywheel rollers to perfectly fit the ball.
What I did for our intake at the bottom to decrease the friction and stop our ball getting stuck was by putting standoffs, which work very well and can help intake the ball from the bottom.
I was saying that those parts were what I would suggest if you did not have them.
Could you post a video of the balls intaking?
Here::: (sowwy 4 low quality, I had to make gif under 100 MBs)
Thanks @BananaPi and @VEX_IQ_R12, Your suggestions of adding torque worked.
Is this the same robot as OP?
No its different from that
Based on R 12, can’t you do a 4 motor drive train, one for intake, and one for choo choo?
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I can’t stop you from doing this. 
You can use up to 6 motors on your robot.
yes but the intake is too weak