Chamfer missing after scaling

[Anonymous]

I'm using 3DS 2019, new to moddeling.

Trying to model a low polly finger but when creating chamfers where the knuckle should be is when I'm starting to have a problem.
The Chamfer is created fine, but when scaling or moving a few vertices on the chamfer line, all of it just disappears.
I don’t know if I’m doing anything wrong, I tried to do it on the other knuckle but same issue, tried to start fresh in a new file but still the same.

The 3 screenshots show the process of creating, scaling and the after math.
Thank you for your help.

[miledrizk]

Hi,

It may be a bug, I'm using Max 2018,

But the only thing that feels suspicious is the Set Key button that is turned on,

Are you trying to make an animation or is it pressed by mistake?

Turn it Off, and if you want to delete any created animation for your object, 

Use Alt+Right-Click the selected geometry and choose "Delete Selected Animation",

And see if this issue continues.