Taxiway signs not showing

I seem to be having an issue where by I create a taxi sign, sometimes it takes a little while to show up, sometimes not, when it seems to be working and I have created a few, then for it to randomly glitch out and just leave a red dot then a while later they all appear again… Is there something I need to be doing or is it just an example of a glitch in the SDK?
Just annoying sometimes it happens when you go to rotate the signs around and it becomes invisible along with all of the other signs