Some characters are suppressed when the bibliography is created


In my PhD, I use references like that [MAR98].

Until now, there wasn’t any issues.

From yesterday, i obtain this :

see first attachement

So the first bracket that is to say this character “[”" is suppressed.

Here you can see how output style is tuned

See second attachement

How can I do so as to suppress this porblems of brackets ? Moreover, I noticed that with another computer but with the same style I didn’t have this problem.

Thank you for your help

output style.gif

What do these citations look like in the “unformatted” curley bracketed temporary citations?  Were they ever converted to “Author (Year)” citations?  – seems weird that it works on one computer but not the other though.