Some fonts do have issues when you explode them. You can go in and manually repair the sketch.
I can see that you exploded your text first before using those newly created sketch profiles to make the extrusion.
Try instead of exploding the text using “sketch text” to make the extrusion. So do not explode the sketch text first. When you make your extrusion right click on the unexploded text and you should have the option of using “sketch text” as your extrusion.