EotH bombing run bug?

[eothfan]

I have noticed that any time I commence a bombing run where the first few bombs land on an elevated section of map, like a mountain or hill etc, the bombs actually destroy the bombers, aborting the bombing run early.  I have not seen this happen on IR or NR bombing runs, only EotH.  Is this a known issue and if so is there any sort of fix?

Thanks

edit:  I also noticed that the EotH bombardments seem to do a lot less damage than IR and NR ones.  For instance, just now I directed a bombardment right on top of an IR heavy factory, and it only did about 3/4ths of the factory's health, whereas IR and NR bombardments will destroy any building even if its on the periphery of the bombardment circle.  What's up with that?