Export STL in size...Open in 3D Printer software as another

I made something on Shapr3D…set unit to inches, made it (3inch x 3inch), exported it.
Imported it to my 3D printer software (Repetier) and it was so tiny I had to scale it 25x to get it to about the right size.

Any idea what I did wrong or how I can correct it.

Love this program, by the way…can’t wait to start having my students use it.