FTP builder workout and Strava Fitness

My FTP was stalled. Started a FTP builder workout however, I noticed that my Strava Fitness score is now flat whereas it was constantly increasing before I started the workouts. Does that mean my FTP level is set too low?

I’m not having much trouble with the workouts except for the Tempo days, which is why i’m hesitating to crank up the FTP.

Thank for the feedback