Can someone explain the new hills please

[Weasel]

Playing some MBT and had my grunts behind what I thought was a ridge line, but my opponent was able to engage this 3 hexes away. I know in the old versions he would have had to be in the hex next to them but not now. I read the manual, didn't understand, quoted it and sent it to my opponent and he didn't understand it either.

I read this:

Terrain, hills and LOS
Each level of hill in the game is broken down into 10 units. Ground level terrain that is "5" high is midway to being a level 1 hill. Level 1 terrain that reports as being "15" high is midway to being a level 2 hill etc, etc to the top level ( level 15 )

The game does not block LOS behind a "bump" in the map until it gets to be 4 higher than the base height for that level ( ground level would be 4, level 1 would be 14, level 2 would be 24 etc etc. ). It will allow you to see over and behind any "bump" 3 and under so any terrain 3 and under above the level you are on will offer neither cover nor concealment.

For example.....

If a unit is at zero height directly behind a 4 high "bump" that is three hexes long , LOS will be blocked for 2 hexes behind the bump. If that 4 high bump is 4 hexes long, LOS will be blocked completely right across the map. If the bump is 5 high even one hex will totally block LOS.

but I don't understand. My infantry was in a hex 5/1/(6) and the enemy was 3 hexes away in a hex 10/1/(11) but looking at the map it looks like flat terrain so it would appear that the rounds are flying straight and then following the terrain over the ridge.