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This can happen when the texture sampling parameters are not set correctly or when the texture format is incompatible with the shader inputs. It can also occur when the texture coordinates are not properly mapped to the object geometry or when there are errors in the shader code. To avoid these issues, it is important to carefully define the texture and shader parameters and to test the application under different scenarios to ensure consistent and correct rendering. Additionally, debugging tools such as OpenGL debuggers and shader analyzers can be employed to identify and resolve any issues that arise.