Yes especially the headstones in the old sections that have been made wildflower areas. Some of the stones that are flat have been covered over by soil and plants, and it's too late to try to see what was on them. Many have cracked and the inscriptions lost but you would have also noticed that. I think it's important to record those ones before they are completely lost. Some have been put on Find a Grave, so don't duplicate the work if you can help it - it's a big job. In some cases I've seen the errors are made on the gravestone not the death registrations.
Have you got the plans of the cemetery from the town council which shows the lay out of each of the plots? Some are not in the place you'd think they should be. They squeezed some inbetween other sections.
It's a good job you are doing.