Error with references after updating OJS to 3.1

We are getting some special characters at the end of references of previously added articles in OJS. Anyone help us to resolve this issue.

Sample :

  1. Gonzalez EA, Sachdeva A, Oliver DA, Martin KJ. Vitamin D insufficiency and deficiency in chronic kidney disease. A single center observational study. Am J Nephrol 2004;24:503–10.
  2. Bhan I, Bumett-Bowie SA, Ye J, Tonelli M, Thadhani R. Clinical measures identify vitamin D deficiency in dialysis. Clin J Am Soc Nephrol 2010;5**:460–7.**
  3. Roj as-Rivera J, De La Piedra C, Ramos A, Ortiz A, Egido J. The expanding spectrum of biological actions of vitamin D. Nephrol Dial Transplant 2010;25:2850–65.