Where are the lost signals?

I'm using Midwest Grain and try to simulate real life in railroad. It means I still save my session because I want to continue next time when I finished before. After some time of playing I noticed some signals disappeared although they are still visible in editor and they are not marked with red exclamation mark in CMP. Can anybody describe me what's happened?

Here are only signal ladders, light signals disappeared (screenshot from saved session):

vince_black_20150324_0000_zpsl0xgtcpj.jpg


And here is the same place on screenshot from editor:

vince_black_20160929_0000_zpse9pbazpo.jpg


BTW top screen is older, I later changed tracks and some vegetation, but after the change signal still were OK. They disappered few weeks later.
 
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