GEDCOM upload loses children

Question

I have previously reported this at [[https://www.wikitree.com/g2g/497069/gedcom-upload-is-diabolical]] but nothing has changed. My latest upload has Edwin Lancelot Diery [https://www.wikitree.com/wiki/Diery-10] arriving ok with his wife and seven children; but his wife Marion Isabella MacDonald [https://www.wikitree.com/wiki/MacDonald-7450] has only a husband and NO children.

Later I found that she had no parents; and each of her parents had three children instead of both of them having six children.

I have fixed all these but this only what I have spotted. What else is there that I haven’t spotted?