Help with Green Eden

I think I have a bug in green eden (new world), I can't take the letter on the desk. Can you help me please ?
Tks and good evening

Please check with the maps if you did everything correctly

I thing I made all, but I can't put the brain in the good place, there is a ghost; and I can't catch the letter on the desk bellow.

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Did you look at the maps?
You need an item to get that letter.
Are you putting the brain in the right spot?

I spoke with all the characters but nothing change. :😢

At least !!! I don't know what I did but the ghost moved !!! Tks for your help !!