Flat parts in height profile of long routes

Hi Richard, sometimes I notice flat spots in the elevation profile when I'm planning long routes. They tend to occur on some of the hilliest parts. If I cut the routes down to smaller pieces, the flat parts tend to disappear, but that makes it more work to check the overall height profile and height meters.

Some examples:

https://cycle.travel/map/journey/177818

https://i.imgur.com/0SSKoQ7.png

https://cycle.travel/map/journey/175642

https://i.imgur.com/CkGZiww.png