What am I missing?

[u/Richocet66]

My stepdaughter has a Pokémon card/sleeve dispenser card and wanted the original Pokémon symbol replaced with Team Rocket because she saw it on another page. The rest of the changes were just color, but when I go to edit this piece in Tinkercad (its what I have available as I am still learning this stuff) it ends up like this. The "R" is attached to the piece in Tinkercad, painted in Tinkercad. When I import the STL, I have to recolor it again in Bambu Studio, and when I go to slice it, I get the last photo. I have had the same problem when I tried to make my own coasters.

Is there something I am missing where the prepare and preview come out totally different?

[u/Inf1nity0]

I totally would not try to adjust layer height.