Problems with Adobe form in Foxit

@loris45933410, First, check the form field's properties to ensure you've designated the font correctly in the PDF.

Second, this could be a shortcoming/bug in Foxit; it's up to Foxit to process the form fields and render them correctly to the end user.

Because the PDF file format is now open source, any company can create a program to open, read, and "process" PDF files (called a "PDF processor"). Foxit is one of hundreds of such companies, as well as Adobe.

Although each company should follow and adhear to the international standards on how to make PDFs that work with all programs from different vendors, in reality, some companies do a better job than others. There are no "PDF police" to cite companies who don't follow the PDF standards.

In my firm's testing and review of PDF-related programs, Foxit has some shortcomings in how compliantly it makes PDFs (PDF producer) and processes them (PDF processor). Forms and accessibility are two areas that show shortcomings. 

To be fair, Adobe Acrobat and Reader have their shortcomings, too. No one company's products are 100% compliant with the PDF standards.

As @try67 said, contact Foxit directly with the discrepency you've discovered. https://kb.foxitsoftware.com/hc/en-us and www.forums.foxitsoftware.com.