Strange problem with reflection on windows and railings

I have used the same shader on both the window glass and the reiling glass, but there is two -2- totally different results in reflections. I have a Hdri Enviroment texture as background image. Does somebody understand this or experienced similar problems?

I would check the geometry first. If the material is identical it definitely has to do with the other thing. Check if the glass is constructed in a similar fashion - thickness, normal maps, displacements, amount of geometry…
that’s my best guess.