It looks like this:
And no, I cannot change the font to something different because this is one of many similar products with a consistent font.
More than likely, it is an error in the definition of the 8 character in the font so the profile is self intersecting. You have not included your part or what font you are using so I can't tell you exactly where the problem might be (obviously on the inner, upper contour of the 8). If you edit the sketch that contains the text, then right mouse button select the text and choose Dissolve Sketch Text, it will turn the text into sketch segments and then you should be able to examine that inner, upper contour to see where there is self intersection. Then you can manually fix it. Otherwise, the only ways around it are to try to find the same font made by a different provider or use a different font.
I hope this helps,
Thank you, Jim. Your suggestion fixed my problem.
Great Gene; I'm glad it helped. In the future, when someone answers your question correctly, please select the Mark Correct button on the reply. That promotes the answer up to the top so other users that encounter a similar issue and find it through searching the forum, they can easily see the answer. I have marked it correct this time so you don't have to (I have permission to do so since I am a moderator; only the original poster and moderators have permission to mark a reply as correct).
An 8 can be wrapped:
In addition to Mr. Wilkinson's comments, Your sketch text appears mirrorred (or something else?).
It reads left-right in the OP image, but the 8 appears upside down. The larger loop is on top.
I don't know if it's related to your issue, but I noticed it and was wondering.
Nested contours. I've seen this issue before with 8, B, along with other characters. Sometimes its the combination of characters or the font type that causes the error. The 8 or B by itself has always worked correctly for me.
That said, look closely at the dash... its high in Gene's image and low in Kevin's image. These sketches are mirrored differently or projected different directions which might be a contributing factor.
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