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Have a look at the kit's schematic files. Probably your input pins are already connected to some caps or other hardware. Schematics have been installed on your PC when you installed the kit files.
Thanks for your response. It turns out P3_4 & P3_5 are tied to I2C_SDA & I2C_CLK while P3_6 & P3_7 are tied to the Green & Blue LEDs. I really appreciate your help.