Stool fats, are fats that are excreted in the feces. One of the functions of the pancreas and liver is to break down dietary fats to a point where they are emulsified. Seeing large amounts of fat in your stools without tying them to heavy consumption can be a sign of a disorder and should be checked by a doctor. Excessive fecal fat can also be caused by the heavy use of laxatives.
Please list the foods you've been eating and in what quantities. Floating FAT in stools is not something I have ever heard of from readers eating the FTS plan so I would dissociate the eating plan from the equation unless you're eating enormous amounts of fat. Are you eating large quantities of fat?
If you are not I would would focus on the liver and pancreas and schedule a fecal fat test with your doctor if it persists.
PS- welcome to the family