Can't put squawk code on Savage Cub Transponder

Hi, I have been trying to put a squawk code on the savage cub transponder but i’m only able to change the first number by rotating the knob. If i remember correctly, before i would press ENT to change between digits but it isn’t working. The same thing happened on the CTLS (same transponder unit). Is it a bug or user error?

Hello, I have the same issue.

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Yes I also have this problem in the Flight Design CTSL

Same with the Icon A5.