Conversion is not happening proper of math journal article with Vitaliy-1/JATSParser


I am facing the issue while processing the JATS XML. When i process the math journal article containing below math synax:

d dt X=V,   d dt V= F ϵ (t,X,V),

After processing, I am getting in HTML plain text.

Can you please suggest?. How can we handle in the library?

Thanks in advance