New year, new problems

Hello everyone.
This morning a new small problem with Arduino (IDE 2.0.3)...
Opening the IDE and selecting last night's sketch, Arduino shows me exactly TWO identical and mirrored ones.
That is to say, if I make a change on one, that change "magically" appears on the other one as well. Compilation occurs correctly, like I have only one.
I have tried loading some old sketches and the result does not change, I am shown two identical and linked sketches.
All obviously with the same IDE....
I don't understand what I have done or if the cat has been walking on the keyboard.
Has this ever occurred to you? And how have you solved it?
Thanks for your help,
Roberto

You're not alone; see [IDE 2.0.3]Double tabs

Thanks for your report @robymak.

The Arduino IDE developers are tracking this bug via the formal report here:

If you have a GitHub account, you can subscribe to that issue to get notifications of any new developments related to this subject.

I did some investigations today and posted my findings on the primary forum thread sterretje shared:

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