Font is changing on all but one page

Two questions:

1) When my site went live, it changed all fonts automatically to some sort of daycare-looking font. Without being able to remember which font came with the GymClub theme, I changed it to Open Sans as a temporary fix. Now all pages but the home page show Times New Roman as the font. Why is this happening?

2) What is the name of the GymClub default font?

Thanks in advance,

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