THANK YOU VERY MUCH NOEL!!!!
You opened me an entire world, because I finally understand the particular meaning of "chorus" in BIAB, that was the key!I followed your explanation and now the song has the right lenght.

In Biab "chorus" has a different meaning than pop or songwriting books. I paste from page 101 of manual:

"Note: We use the term “chorus” as commonly used in Jazz music. A chorus therefore means once through the entire form of the song. A typical length of a chorus is 32 bars. A song may have the form AABA where the A sections are verses and the B section is the bridge. This entire form AABA is called one chorus."