Some children's show I guess. Lemme check.

https://en.meming.world/wiki/Well_Yes,_But_Actually_No#Origin

A claymation, stop-motion picture titled The Pirates! In an Adventure with Scientists!, also known as The Pirates! Band of Misfits in the United States, was released in August 2012.

One of the movie's characters, Pirate Captain, responds to a question posed by another character with "Good guess, but actually no." The line is frequently misheard as "Well yes, but actually no," giving the image macro its trademark line.