End Mill Bits To library

HI I have A shapeoko 4x4 and Just Added A Spetool 1/4 End Mill O Flute Up Cut to My Library
When I Go To Make A 1/4 " Hole i Make it 0.27 and With A 201 End Mill It Works Perfect But When I Do The Same And Use The Spetool It Cuts The Hole Way To Big . Like 3/8
What Could Be The Cause ?

See: Tool Libraries

and

Note that since the move to curated values in 434, certain entries which were required are now hidden in the data since they are not needed.

If that doesn’t help, post a link to the specifications for the tool in question, a screen grab showing the edit screen, and a photo showing how an attempt at cutting turned out.