grove i2c rgb lcd display issues

I am finding the even using the provided examples with the library from github, it will sometimes miss a char or even display a different char than asked. anyone have a clue why this is happening and how to fix?

Linkit one with firmware and support libraries 1.1.17
Grove I2C RGB LCD display connected directly to grove port on linkit one

Sorry for the delayed reply.

Please provide the following information.
1.Which example program are you using.
2.Screenshot of the error screen.

Thanks and Regards