Turmeric Curcumin Curcuma Açafrão-da-terra

So basically since a I was kid I had no issue in seeing stereogram images. But the 3D effect is “reversed” for me . For example in this image( taken from Wikipedia ) i can tell there is a shark because I recognize the borders , but the figure is “hollow” for me , like a negative plaster mold. Anyone else has the same problem? Maybe is a technique issue ?

I found this sub these days and I am amazed of this visual effect lol. I take theses photos with my movile last night walking the dog and I thing i get the effect pretty neat (I just used my regular movile a few centimeters appart) Hope yall like it

if you align both faces it's like a dna helix with 3 faces & if you align the eyes over each other an additional time it forms a pyramid with an eye in the middle