After examining the SVG, I notice that you have a custom dash stroke set on the text.
Select the text object, go into the Fill and Stroke panel (Shift+Ctrl+F), then into the Stroke Style tab
Set the dashes to a normal solid stroke
Click to see larger
Note: If you don't want a stroke, just remove it in the Stroke Paint tab. Hit the X to remove the stroke.
As to how this happened you may have just accidentally hit it, or the text tool has inherited the dashed stroke you used on another object.
If the latter is the case, then to prevent this from happening in future go into Edit > Preferences > Tools > Text, and set the option that says "This tools own style". If you have it set to "Last used style" it will inherit the last style you used, i.e. a dashed stroke.