Actually, there are a number of pink flowered forms of D. burmannii found in different areas of the world, e.g. the form discovered by Robert Gibson in Southeast Australia dubbed "Pilliga Red" which I have never cultivated.
The plant in question came from seed which (I believe) was sent to my by my friend in Brazil. It is not D. sessilifolia which I can recognize as distinct from any D. burmannii that I cultivate, both by its lamina and its overall size. At the time I received the plant, neither my friend or I cultivated this species. So whatever this is, it is not D. sessilifolia.
However, there is a remote possibility that the D. burmannii "red tentacle" form (which as ALWAYS flowered white for me) may have been visited by a pollinator that also visited the D. sessilifolia (which is invariably pink flowered), and this is an example of Drosera x theocalyx. Since Drosera pollen is not airborne, this would be the only way I could account for the pink flowers. I do not cultivate any other pink flowered D. burmannii. The plant I sent to PAK was in all ways D. burmannii and not D. sessilifolia. The mendellian ratio Darcie noted of white to pink flowers makes me suspicious that this unlikely event may have happened.
I am currently checking with my friend in Brazil to confirm that the original material I grew from seed originated from his collection as I believe it did.