If you've copied your answers from another source (word document, different website etc.,) then it most likely carried its own formatting from there and didn't clear when you copy pasted.
It's highly recommended to remove any text formatting before you copy paste. Steps to do so are mentioned while you are creating any FAQ.
But if you've already done with creating many FAQs and it's too late, you can apply custom CSS like below which would remove that formatting. Depending on answer structure, following CSS code might change. If it doesn't work for you, please feel free to contact our support.
.faqPlusAppContent span {
font-family: inherit !important;
}