CASIO fx-9750GII for bond evaluation problems

I am having a problem using my calculator for bond problems when it comes to using semi-annual payments. Here are two nearly identical questions, both calling for semi-annual payments. One is giving me a correct answer when I set it to semi-annual on my calculator, but the other is giving me the correct answer when the calculator is set to annual. Please help.

Question 1:

A 10% coupon rate bond makes semi-annual interest rate payments. Par value is $1000. The bond matures in 13 years. The required rate of return is 8.27%. What is the current price?

My Screen:

d1 01M01D2000Y

d2 01M01D2013Y

RDV = 100

CPN = 10

PRC = 0 (until I solve obvisouly)

YLD = 8.27

I am able to solve for the correct answer ($1,134.73), but when I solve for this correct answer, it is done under annual calculation in the set up menu when the question states semi annual interest rates.

BUT, when I solve this second almost identical question, I get the correct answer using semi-annual calculation in the set up menu, and if I switch it to annual it gives me an incorrect answer.

A 7.5% coupon rate bond makes semi-annual interest rate payments. Par value is $1,000. The bond matures in 7 years. The current price of the bond is $948.25. Calculate the bonds YTM

My Screen:

d1 01M01D2000Y

d2 01M01D2007Y

RDV = 100

CPN = 7.5

PRC = -94.825

YLD = 0 (until I solve obvisouly)

When I solve under semi-annual, I get the correct answer of 8.496%, but annual gives me an incorrect answer.

The only difference I can see in these questions is one is asking for price and one is asking for YTM, but both give semi-annual payments and only one is giving me the correct answer using the semi-annual setting on my calculator. Am I doing something wrong or is there a way to get the correct answer in both questions using the semi-annual setting. This has been confusing me a lot on various problems.