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Hi, the correct cartridges for the MC2535adwe are listed on the following page https://www.tonergiant.co.uk/model/Lexmark-MC2535adwe-toner-cartridges/ however Lexmark manufacture 2 versions of every cartridge with differing codes (return program and standard). We only sell return program cartridges so it could be that the cartridges that you currently have are standard cartridges.
The difference between them is that the return program has recycling instructions in the box where standard cartridges don't, and for that reason are cheaper than standard toners. I hope that makes sense! If you need any more advice please let us know.