A shelf's stops and raised edges are designed to work in a particular orientation. Reversing it can affect how it rests and how far it can slide.
What the observation means
A shelf that appears to fit is not necessarily correctly installed. The manual's illustration shows which edge belongs at the front and how it engages the supports. Do not rely on memory after removing shelves for cleaning.
A useful next step
Refit only as the owner instructions permit and confirm secure support while cool and unloaded. If a shelf slips or its supports are damaged, stop using it. Do not bend the wires or improvise a stop with screws, clips or an unrelated accessory.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.