Prince Harry's comments that he needed to protect his grandmother the Queen were because he fears Prince Andrew getting close to her again.
Harry missed the memorial of his grandfather Prince Philip due to an ongoing row with Home Office security.
In his absence, the Queen was escorted to the memorial by disgraced Prince Andrew, who was at her side the whole day.
In an interview with US TV ahead of the Invictus Games, Harry referenced needing to protect the Queen, baffling experts as to the meaning of his comments, which he has since refused to explain.
Prince Harry, Prince Andrew and the Queen
GB News
But a Buckingham Palace insider believes Harry was referring to his uncle Prince Andrew becoming closer to Her Majesty.
A Palace insider told The Mirror: "Those images of Prince Andrew escorting the Queen to Westminster Abbey may have upset Harry, which is now believed to be one of the reasons he made such an astonishing remark.
“Harry is familiar with the Queen’s aides and there is no animosity at all.
"The Palace were aware he might do an interview, but no one was expecting those sorts of comments.
Britain's Queen Elizabeth, accompanied by Prince Andrew, Duke of York
POOL
“He seemed to be implying he had concerns over the Queen’s safety.
“There is a feeling this may be linked to Andrew who has grown quite close to his mother in recent months.”
The Duke of Sussex has said many Invictus Games competitors would have taken their own life had it not been for the sporting event.
Harry founded the Invictus Games to aid the rehabilitation of injured or sick military personnel and veterans from across the globe, by giving them the challenge of competing in sporting events similar to the Paralympics.
Speaking at the closing ceremony in The Hague in the Netherlands, Harry spoke of his pride in the competitors sitting before him.
He told the audience: “You have all summited your mountain. And I could not be prouder of every single one of you.
“We, your friends and family, could not be prouder of who you are and what you represent, especially given what it’s taken to get here. Mindset is everything.”