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STL export adding faces to model

I have a model that is like a cookie cutter with 2 "walls" which looks good in tinkercad:

But when i export to stl format and open in other 3d editors, the model has added a "top" face to the cookie cutter:

 

Same problem when importing the stl back into tinkercad:

Any ideas how to prevent this?

 

Thanks!

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