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Hello Pablo,
I noticed that sometimes when I need to move some fields in a form by global select and move with the mouse, these fields are duplicated and it is not noticeable,
After several times my form may have the same fields n times, but this behaviour is not systematic,
Did you have this feedback ?
Best regards
Philippe

If you hold down the CTRL key while moving the mouse then the object will be duplicated. This is a feature, to quickly copy objects.
To prevent this, do not hold the CTRL key while moving.

I had a similar issue awhile ago and I think it could be the same problem.
It can be shown as follows:

1. Create a form with say 3 editboxes.
2. Click outside the form.
3. Press CTRL and select editboxes 2 and 3 by drawing the mouse round them (I've forgotten the correct terminology!).
4. Press CTRL and select editbox 1.
The selections are cleared and if you look in the Object Manager you'll find that editboxes 2 and 3 have been duplicated.

If you use SHIFT instead of CTRL in 4. then it will be OK.

EDIT: Pablo, I just posted this before seeing your reply.