Yes, it's normal. Most people can back squat substantially more than they can front squat.
For example, front squats are a relatively strong exercise for me, and my front squat is just over 80% of my back squat.
230 strict press @ 220; bodyweight+187 X 4 dips @ 180; 403 front squat @ 210; 10 000 push-ups.
Ignoring irrelevant credentials since I was 17.