William, your profile example is set to Private, so we are unable to see the connection issues you speak of. If you don't wish to open up the privacy to a more public level, then perhaps we can be added to the Trusted List temporarily while we help resolve your issue.
Otherwise, perhaps a little explanation of WikiTree and Gedcoms are in order...
A Gedcom is just a database of records. Each record (that is not skipped during the WikiTree-gedcom import review process) is imported into WikiTree as a new record. Any pre-existing WikiTree records will not be updated, so duplicates would be created instead.
All records imported from any one Gedcom will be connected to each other once imported into WikiTree (assuming they were already connected to each other in your Gedcom), but manual connections will have to be made from those records to any pre-existing WikiTree records after the import.
For example, say I have my Mom's profile in WikiTree already, and I upload a Gedcom containing only her parents and her brother. Then I will have to manually connect my Mom's WikiTree profile to her parents, but her brother will already be connected.
If I later upload another Gedcom, still including her parents, but this time all seven siblings, I should skip importing the parents and one brother, else duplicates will be created. And the newly imported siblings will still each have to be manually connected to the parents.
Half-sibling relationships mean that all the siblings aren't connected to the same parent. Double-check the WikiTree-ID of each parent, for each child, and make sure they are the same.
It sounds like there are duplicate records of the parents, and merging them together should resolve the issue.