Regarding creatine, usually low creatine is associated with low muscle mass. For instance, my mom's creatine is a little low because she never recovered all her muscle after her several-month water fasting alternative cancer treatment. All her other stats are great. So it is reasonable to suspect her lowish creatine is simply because of lower muscle mass.
Your higher creatine may simply be the opposite, since you're a big guy.
Take that with a grain of salt, but if you wanted to look into it, there is a starting point.
5'6" Female, 29 Years Old, 260/195/120
"Discipline is choosing between what you want NOW, and what you want MOST!"