Bug in shaper interface

[Easylarveur]

Hello,

I have just noticed what might be a bug in the shaper interface.
I am using OpnSense 19.1.1 in French, after an upgrade from 18.7.10. The hardware is a Deciso 2630.

There is a bug in the pipe settings interface.
The mask option let you choose between 3 possibilities as shown on attached picture. And The first one is very strange.

Am I the only one with this issue ?

Bye.