Strange characters of options tab on checkbox.

This is a simple question about the checkbox. My environment is not English.

When I create a check box, the following strange characters appear in the Export Value field in the Options tab. I'm guessing it's probably garbled for some reason.

・・0o0D

Previously, some operation code related to checkboxes did not work as intended. I didn't understand the cause at all so I was like addicted anything to it for a few days. Finally, I was gazing at this strange characters. I tried rewriting this to "On" and it suddenly started to work.

What was originally written here? And is this a non-English versions bug?