secure browser has wrong calculation in pdf files

I have a pdf file with a total calculation of several fields. There are sums of money, e.g. 205.24 ; 502,65; …
In all other browsers, the calculation works correctly, but in the Avast secure browser the amounts are not added up correctly. From the comma a 0 is created. Thus, the Avast secure browser adds in the PDF file 206035 ; 502065 ; …
The formula in the PDF file is correct and if I perform the calculation in other browsers, or in Adobe Reader, the result is displayed correctly.
If I enter the amounts of money in the Avast secure browser with “.” instead of " , " then the calculation is correct. But in Europe, the amount of money is separated with “,” and the separator at a thousand is “.” Is there a remedy for the bug?

Not quite sure what you mean since your browser only displays the pdf file.