Slicer Issue or STL model issue...not sure.

[Gymanji]

I've modified a model from thingiverse (a medallion, attached). It seems to be sliced to print 'on edge' even when it's layed flat. Not sure how to fix it or where the issue actually lies. The design requires filament changes to change colors which is why it needs to print flat. Not to mention, printing a flat disc on edge seems a poor idea.

Any advice? I did load the model onto makeprintabe.com and the output was still showing to print on edge.