OEM drawer slides are usually not high quality. Save yourself some frustration, measure the drawer and existing slides and go to a hardware store and buy some good drawer slides to replace yours with. You will fix the alignment problem at the same time.
While your at it, replace the drawer catch with a better catch. We usually get the 15lb catches.
We replace all the catches and slides when we get a new RV. Saves me frustration down the road, not having to replace them one at a time
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD 4dr short bed Duramax w/allison
Reese Fifth Airborne air ride king pin coupler with Sidewinder