I have an module related to Quality Control were the temperature are being entered in the text field and char field with the help of character map I used to enter the degree centigrate, approx. value, subscript,superscript value like related to chemical formula like H2O, H2SO4, etc.

But what is happening here whenever I try to print the record it came like a vertical horizontal bar instead of showing the special symbol.

I am using wkhtmltopdf 0.12.6-1 as my latest version I also tried with 0.12.5 but not working

My current environment is Windows Server 12, odoo 12

please help me here

Thanks in Advance