[Mark McLeod]

Could be your Teleop loop is slower than the 50Hz packet rate.
You might be dropping every other DS packet and your playback rate would appear half speed.

Check the timing of the Teleop loop with Greg's Elapsed Times.vi under Support Code in your Project Explorer window.
Drop one copy in Teleop and another in Autonomous to compare the speeds.
View the Elapsed Times front panel while running the code from your PC.

Then match the Autonomous loop to the times you're getting from Teleop.
I'd suggest using Wait Until Multiple to get the times. A simple Wait will lag just a tiny bit every loop.