u/DefinitionOwn9458

I was sorting through some of my slabs and saw something that I hadn’t noticed before. There is a first edition stamp on the BACK of my first edition red cheeks Pikachu card in the same spot as the front but inverted. It looks like it somehow got stacked on top of another card where the ink hadn’t dried and got on the back.

Has anyone seen this before? Does this make this more valuable?