FF is telling you that you are "probably fertile" due to your CM, not your temps.
Temps can be really erratic at the beginning of your cycle... I know mine are sometimes. So I wouldn't worry too much.
The other ladies are right... everyone's body is different, and sometimes your own body may be different from cycle to cycle. For example, my post-O temps used to be between 97.6-98.0 The past few cycles, my post-O temps have been between 97.7-98.6
I look forward getting to watch your chart and getting to know you better! Loads of helpful ladies here who will be more than happy to stalk your charts, help you interpret them and get all excited with you over all the variations!!
Here's some Baby

just to get you goin'!!