Absolutely no worries. This is actually preferable. Simplifies what to look at and you hold onto your hard work.
I’ve identified the problem areas. Expanded the gap to make it obvious:
However, they aren’t joining in conventional ways.
Try this:
- select object
- Arrange->Break apart
- select all parts of the now broken apart shape
- Edit->Auto-join selected shapes
Hopefully the shape should now be closed.