SSRS Wingdings 2 checkboxes appear as R and £ on pdf

Hi I am using below expression in SQL Server Reports to assign value as check/ uncheck to boxes using font Wingdings 2. The problem is that on my local machine the pdf shows up correctly with checkboxes but on server the pdf is generated having "R"& "£". The server has the font installed already. Any idea what might be causing this?

IIf(First(Fields!Complications.Value, "dsRoSDiabetic").ToString().Contains("Complex"), Chr(82), Chr(163))

Thanks