Mass-effect – Why is the damage so different

If you're an Infiltrator then Sniper Rifles and Fitness are both unlockable talent for your class, you will get access to them, but not at the start of the game.

To unlock any locked talent, you need to first place a certain number of points in to another talent first.

For the Infiltrator class these are:

• Sniper Rifles is unlocked when your Pistol talent is at 5.

• Fitness is unlocked when your Tactical Armour talent is at 6.

• Dampening is unlocked when your Electronics talent is at 4.

• First Aid is unlocked when your Decryption talent is at 7.

As per the Mass Effect Wikia.

Unfortunately, this is a bug for adepts and sentinels. The problem is that your power wheel has become too full so your bonus power cannot fit inside and, therefore, you lose it. The only way to avoid this is by taking a weapon bonus power for adepts and sentinels or setting your bonus power as the hot-key bonus power before you have too many others while the bonus power still appears on the wheel.