Q. I saw a different writing style for the hiragana "ki" and "sa" on your site. Are they both correct?
A. Yes, they are both correct. It is just different style of writing. Let's compare them.
Computer fonts are usually the style on the right. Here are some hiragana charts using computer fonts.
Click here for my "Hiragana Chart" which includes another style of writing.
When handwriting, people tend to write with the style on the left. At calligraphy class, teachers usually teach this style as well. However, it is just personal preference and you can use whichever is easier for you.
There are also slightly different styles for the hiragana "fu" and "yu."