Sometimes the little pastic release levers on each side both push down, or both pull up, or one is up and one is down
In every RV I have ever owned I have had to 'adjust' or reposition drawer slides for correct functionality. Sometimes this required adding wood pieces to the frame.
While you are working on them, you might as well put in stonger strength catches to keep them closed while traveling. .
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Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
Reese Fifth Airborne Sidewinder