Bounding box of a symbol moves out of the object after scaling a group

I have a selection of symbols I have been using for a longer time and they have been working ok. Only now I have met a problem: I'm having a group including sevearal symbols and other vectors. After scaling the group one of the symbols can not be touched anymore. Now I have noted the bounding box of it can be found somewhere several centimeters out of the symbol. But still I can not touch, move, replace or change the symbol nor the bounding box. The original sized group including the very same symbols are working with no problem as long as I don't scale the group. Is it a bug? Or something I can correct? Setting the original bounding box size is not changing anything, nor does it help to copy the same group on a new file. As you can see on the picture: the bounding box of the symbol (the text) has moved below it.

Updating: Here's not exactly the same but similar situation:

The layer seems to be empty on the list. When hiding it, it picks only a part of the symbol off. When the layer is hidden (but still part of the symbol visible) I can not touch it. When it's visible I can not touch the symbol on it's place but I can re-size the bounding box outside of the symbol but not move it.