CAM Charge and Management Fees

[Karisa M.]

Commercial property management company charges 5% of monthly gross income as its fee, which includes CAM income. The tenant's lease is NNN and property management fees are considered a CAM charge. If the tenant is paying a monthly CAM fee (which includes property management fees) and the property management company is charging 5% of gross income (which includes CAM), is the tenant being double charged? Even if so, is this standard?