Why does my Element Classic 40/250 work as 60/250?

My Element Classic 40/250 Windows 7 console is having the following problem: it's working as if it were a 60/250.

When I move slider 01, it acts as channel 21 on the screen, and the display shows 3 lines of channels instead of 2. When changing pages, it goes to channel 61. I don't know if it's a setting I can modify or if I need a specialist

.

Any tips?

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