Well to be more accurate i think i kinda identified the problem.
Titles are coded on particular character data value right ? Which can go up to 32 bits. So it means 32 bit "1" minus the first that is a dummy, so 31 titles when pushed to the limit. These are 14x2 from old titles, then new arena titles, then special titles. These can be looked after by changing manually the field "chosen title" which allowed me to identify 40 total titles. I can't quote the missing ones on the forum but that makes 9 of them impossible to activate on the select-title list, because out of range. So, either they are coded on 2 bits and i can't find the 2nd one, or the limit to 32bits prevents from reaching them. Eitherway, the command .modify titles relates to one bit only.
However i have no idea if this is a problem or if i just can't find the data.