Yes, hiragana is kind of funny like that, isn't it?

Those are just the two ways of writing the letter "sa." It's the same with "ki," it can be written either like a backwards "chi" with an extra line, or the way that I believe you are familiar with.
I like to think it like the letter "a." You know how normally, the letter a is written like a little "o" with a line on the side by hand? But on the computer, with certain fonts, the letter "a" is written differently.