When pasting symbols, some part disappear

Hello.

I have a problem, I some symbols I need to paste into another document.

but when I do it, some parts of the symbol dissaper. It's not that they become transparent. They're not there.

If I brake the symbol on the original file. I can paste everything fine.

but I have to keep them as symbols, and I don't want to brake, and re-make the symbols every time.

does anyone have an explanation/solution for this problem

thanks.