When Slicing Fonts converted to STL's some characters of the same size and font slice and some don't.

[Coldon]

Describe the bug
I am printing text onto a surface. Some parts don't print and some do for the same character. The problem shows up worse with the KISSlicer, but parts are missing with the Slic3r also. I will attached before and after sliced pictures on the KISSlicer

To Reproduce
Steps to reproduce the behavior:
It's a slicer issue.

Expected behavior
I expect all the +'s to slice. they are all the same size and same font. Some -'s slice, some don.t I attached a before slicing and after slicing picture. What it shows on the sliced view is how it prints.

Screenshots
If applicable, add screenshots to help explain your problem.

Operating System (please complete the following information):
Windows 10
Firefox Browser