Mum-of-three Kate posed with Prince George, Princess Charlotte and Prince Louis for the sweet Instagram snap.
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But international picture agencies Reuters, AP and AFP have all issued “mandatory kill” warnings for the family photo.
Royal fans spotted that eight-year-old Charlotte’s hand does not line up with her red jumper sleeve in the picture.
Editing photos for public release is standard practice.
The photograph marks the first time the princess has spoken out publicly since her surgery.
It is also the first picture shared of the royal since she underwent her “planned” major abdominal op in January.
Devoted husband Prince William took the family photo at Windsor earlier this week.
Kate captioned the snap: “Thank you for your kind wishes and continued support over the last two months.
“Wishing everyone a Happy Mother’s Day. C”