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It may be your slicer or the SD card you are using. The STLs are good. The slicer you use creates the gcode, so different slicers will create different gcode files. SD cards from Creality have also been known to have corrupt memory issues. Try a different SD card. These parts have all been tested with CURA and Simplify3D. I have not tested Slic3R or other lesser known slicers.