You're in engineering notation. This is similar to scientific notation, except that exponents will always be a multiple of 3. For 8+9, you're getting 17x10^0 = 17, which of course is the correct answer.
Press MODE to enter the Mode editor. On the top line highlight NORMAL and press ENTER. On the second line highlight FLOAT and press ENTER. Press 2ND [QUIT] to exit the Mode editor.
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