Window sill house exterior aluminum not properly installed?

Hello,

Two years ago we built a timber frame house with wood fiber insulation boards and aluminum window sills / window ledges on the outside.

I have just now noticed that the window sills / ledges can be pressed down in the middle without any problems. It seems to me that they are not properly installed or fixed, or fully glued, and only rest on the reveals on the left and right, with a complete hollow space underneath.

Since it is a prefabricated house, this was of course already installed at the factory and I could not see it.

Now the question is whether this is really correct (because it is like this at every window), or if it was not properly mounted (possibly there are regulations or guidelines for this).

Thank you very much in advance.

Regards

Show me a picture from below... but I don't think there is a defect... as long as it is not a windowsill to step on (Terrassentür).

Hey, Thanks for the quick response. A picture from below is not possible right now (work), but from below you won't see anything except that it has been cleaned there. There is also an aluminum windowsill at the terrace door. I bought a fly screen or fly screen door with installation and he looked strange at first because there is simply nothing underneath to attach to (running rail), until you get properly angled into the wood. I can take pictures this afternoon and upload them.