CASIO fx-991CW

[wb.c]

Definitely not a glitch, just a bad design. ANS is basically a variable, and when you do shift+EXE you are reevaluating the input, but ANS takes on the value of 1/2 from the previous result, which is why you get 1/4 the second time. Do it again and you will get 1/8. Getting rid of the dedicated S-D button was a terrible decision. Just another reason to go with a TI-30X Pro MP instead haha