What is the problem?
GCode Viewer shows wrong model size
What did you already try to solve it?
Not sure what to try. Does not affect the actual print. Just a cosmetic display issue.
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware,
serial.log or output on terminal tab, ...)
I just got OctoPrint setup with my Prusa i3 Mk3. I uploaded a test print directly from Slic3r PE. I noticed that when I go to GCode Viewer it shows "Model size: 142.53mm × 125.54mm × 10.00mm" My test model is a simple block that is only 30mm x 30mm x 10mm. I sent the print form OctoPrint to my printer and it printed in the correct dimensions so this looks more of just a cosmetic issue in the GCode Viewer.
I did the same process with another model and the GCode Viewer showed the wrong model size on that one also.