Okay, obviously the field in your database is defined as boolean (ie: Yes/No), and your option buttons' values are bound to that boolean field.
Here's the good news. It doesn't matter what's really stored there, you have control of its appearance.
Go to the table in design mode and click on the boolean field.
In the Lookup tab in the Field Properties section of the screen, make sure the display control is set to "Text Box"
Click on the General Tab and set the Format property to Yes/No.
Save the table. Now when you open the table it'll show Yes and No values.
When doing any code for this boolean field you can refer to the field's value as True or False, Yes or No, On or Off, or 0 and -1.