The Japanese song, the second one of the three, reminds me when I was little in Taiwan. The other two songs were popular among Chinese while I was studying at NY when I was young. It seems to me that Joanna is a lovely young lady with an old soul. Bravo to your performance!!
If you are totally immersed in the beauty of her singing and enjoying her fabulous performance, why do you care about those minor technical issues unrelated to her?