Reoccurring CIN but low grade changes

Hello

About a year and a half ago I was found to have moderate changes in my cells that were removed. 6 months later I had a routine smear/check up and was found to have low grade changes and told not to come back for another year. My concern is if changes developed again only 6 months after lletz, should I not have been asked to go back sooner to check they hadn't progressed to moderate/high grade?