Growth scans

I’ve been having growth scans since 28 weeks every 4 weeks but after my scan 2 weeks ago at 32 weeks the baby was growing big at 2 weeks ahead. Because of this I was referred to another growth scan 2 weeks later (today) and now he’s plotting lower on the chart than last time. My plot was between the 90-95th centile and today it was between 50-90 so still ahead but the sonogrpaher seemed a little concerened. She said that the other scan images might not have been accurate or he may have just slowed down growing. His stomach and head are still growing ahead but his legs are now growing a week behind which is strange! Has anyone ever had anything like this?