5 second delay between nav points? Please help!

This seems this is a fairly common problem, but I’ve seen no work around.

My AI with simple ‘find next point’ - ‘Move to’ BT tasks seems to have a delay when a point is reached stemming from the AI not being able to reach the z location of the destination.
The ai seems to continue to try to reach the z location causing a delay between points.

If I open a new map or even make a plane in the existing map at a Z coordinate of 0 the AI works fine!
However I have water and sidewalks which bring the ‘floor’ Z higher.
Please, any suggestions would be greatly appreciated, this is driving me nuts.
2022-06-14 14-16-40