text on shape changing upon clicking

Dear all,

I am struggling with this - on my storyline slide - i have a freeform multiple choice question designed. The correct answer to that question is twenty eight however earlier twenty seven was written on it.While editing the slide, i corrected it to twenty eight. now when i click the twenty eight, it changes the colour of the shape on which it is written (a feature) but also changes the number to twenty seven.I am unable to correct it. Please help.