The issue was identified; a mod with Prop Snapping functionality was missing. I recommend Prop Anarchy temporary fix and the mods that go along with it, and I have added the info to the signals user guide (linked at the top of the page) accordingly!

He is right I can't move them up or down. and i have the stuff you told us to do. Is there something wrong with the model.

If prop snapping is disabled, prop heights may be reset by certain actions - there is also an issue with move it for some users where moving a prop causes its height to reset; I mention this in the user guide as well I believe but a workaround, especially with a group of props, is to copy it, then adjust its height while copied before actually placing it down.

my new issue is that i lower the signal heads with the page down key, soon as I get it at the level i need it goes back up to default height?

I am in love with this. I can't wait to see what you do for the new road Crossings.