I thought first I should put it as a discussion but actually I am interested in an answer...
More details on my question:
When I open (drag&drop) a txt file (table) to my mxd, the order of the fields is randomly changed compared to what I see in excel or an text editor. For example, the first two columns end up being colums 18 and 19, column 8 becomes column 20. When I export it to the gdb I have my old order back.
It is not really a problem at the moment but I am a bit confused why ArcMap does this.