Measurement problem

Hello to all,

following problem:

the word “Beverly” as Curve with a circle curve as bevel object. The bevel object is 16x16mm. “Beverly” should be available in 3 sizes but every “Beverly” should have the same diameter (16mm).

I links the 3 sizes to the same bevel object but the diameter is not the same.
How can I fix this?

I attached screenshots of the 3 objects to see the parameters in the N-tab. Scale is at 1.