Look at my PM statement and tell me if were being overcharge

[Par Attaran]

We hired a property manager Dec-1-2016. They rented out our completely rehabbed property Jan-1 to a Sec 8 tenant. We have never used Sec 8 before and were not familiar with Sec 8 inspections or requirements, but decided to give it a shot as our other properties are not Sec 8. 

Upon checking our recent statement I noticed around $1000+ in repairs 

Our Property Manager is currently looking into the charges. We are being told "Its normal for Sec 8 to require some repairs and or additional items/ad ons"     

Our Management agreement states "Management will obtain prior approval of Owner for any item or service in excess of $400, except for monthly or recurring expenses and emergency repairs"

We were only notified of these repairs until AFTER they were completed. 

Is this normal for Sec 8 inspections and repairs? Can our PM just randomly charge us for this stuff with out consulting us first since its a "requirement by Sec 8 and must be completed" 

Thanks for any help :)