why does my frctions button display like this on my fx-991CW+?

why does my frctions button display like this on my fx-991CW+?

recently my calc was displaying the fraction as symbol show in image above, why does it display it this way? and how do i fix it? i looked in the setting but couldent find the cause, please help.

u/IGnat0r-200 — 11 days ago