Particular word cannot be copied

Hi,

I am very curious about this problem in my MS Office.
When I put the name of our client without Inc. at the last, I can copy it in different MS App.
But when I already put the Inc at the last, it cannot be copied anymore, especially in MS Excel, which i use most often.
When I tried to paste it at MS Word, certain codes (as it looks like to me) appeared.

But when I add some letter from the entire word, with Inc in it, it can now be copied and pasted.

This happens in this particular client only. I tried to look for its format, but right click or even pressing the shortcut key in keyboard do not work. I need to press Cntr+Shift+F, and whether I check/uncheck the "Locked" on its Protection, it still cannot be copied/pasted.

Please help.
Thank you in advance!