Global Mapper Pro

LiDAR points on smooth terrain NOT classified as Ground

Airtrooper Global Mapper User
I have a dense LiDAR point cloud (approx 1 point per 50cm x 50cm) over gently undulating terrain. I need to create a DTM with groups of trees removed, so I classify for ground points. The trees are correctly classified as non-ground. However, in open ground I get clusters of non-ground points, which clearly are actually ground. I cannot understand why, as they do not differ from the others in terms of relief, slope or curvature (there is no vegetation present either)...

This wouldn't be a problem, except when creating my DTM these then become potholes! There are lots of them too! Too many to re-classify by hand. What is going wrong and how can I prevent it?

Many thanks.
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