Closed tickets continue appearing as opened

Hello,

I manage a OTRS-5 (5.0.11-01) server that, I don't know why, when I 
close a ticket, it continues appearing as a "open ticket" in "Tickets -> 
Status". However, in a fresh installation of OTRS-6 (6.0.1-02), doing 
the same process with a received ticket, it appears as "Closed" in 
"Tickets -> Status".

In my OTRS-5, some month ago I created some new status "progeso-25%, 
progeso-50%, progeso-75% and progeso-90%". A member of this mailing list 
told me maybe the problem was that my new status contained "%" and "%%" 
is the separator character between history steps in each ticket, so I 
decided to disable that status and create new ones as "progreso-25, 
progreso-50, progreso-75 and progreso-90". However, closed tickets 
continue appearing as opened tickets in my OTRS-5.

Now, for preparing this mail, I have installed a OTRS-6 system. There, I 
have created a new status called "Medias". I have created a new ticket; 
then, I have changed its status from "New" to "Media" and, then, from 
"Media" to "Closed". In this case, ticket appears as closed.
This same scenario has been copied in my OTRS-5 running system. I have 
created another new status "Medias", I have created a new ticket, 
changed its status from "New" to "Media" and, then, from "Media" to 
"Closed". In this others case, ticket continues appearing as OPEN.

I don't know where is the problem... My screenshots are located at 
https://aomail.uab.es/~druiz/ (I would like to attach them, but message 
size limit is too small). I have not found any possible reason...

I need help, a lot of help...

Thanks!

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