Some issues in elsarticle-num bibliography style for elsarticle class

Question

In the following document, I use the elsarticle class and its elsarticle-num reference style. There are some minor but important issues in the output result:

1. The first reference which is a website has two major problems.

   • The url address appears in a new line rather than being in the continuation of the first line.
   • Second, its font format differs from the others.

2. In the 3rd reference, the year does not appear in the output.

3. In the 4th reference, although I have written "PI" with capital letters in bib1.bib file but it appears as "pi" with lowercase words.

\documentclass[preprint,12pt]{elsarticle}
\biboptions{sort&compress}

\begin{document}

\section{Introduction}

Here goes some literature review from e.g. 
\cite{Latex,siciliano2016springer,khalil2002nonlinear,shahnazi2008position} 

\clearpage
\section*{References}
\bibliographystyle{elsarticle-num} 
\bibliography{bib1}
\end{document}

bib1.bib

@book{siciliano2016springer,
  title={Springer handbook of robotics},
  author={Siciliano, Bruno and Khatib, Oussama},
  year={2016},
  publisher={Springer}
}

@misc{Latex,
  author = {An expert},
  title = {LaTeX experts},
  url = {https://tex.stackexchange.com/},
}

@article{khalil2002nonlinear,
  title={Nonlinear systems, 3rd},
  author={Khalil, Hassan K},
  journal={New Jewsey, Prentice Hall},
  volume={9},
  number={4.2},
  year={2002}
}

@article{shahnazi2008position,
  title={Position control of induction and DC servomotors: a novel adaptive fuzzy PI sliding mode control},
  author={Shahnazi, Reza and Shanechi, Hasan Modir and Pariz, Naser},
  journal={IEEE Transactions on Energy Conversion},
  volume={23},
  number={1},
  pages={138--147},
  year={2008},
  publisher={IEEE}
}