Problems navigating with the TAB key in FORM 12

Forms [64 Bit] Versión 12.2.1.4.0 (Producción)

Oracle Database 11g Release 11.2.0.4.0 - 64bit Production

Oracle Toolkit Versión 12.2.1.4.0 (Producción)

PL/SQL Versión 12.1.0.2.0 (Producción)

Oracle Procedure Builder V12.2.1.4.0 - Production

Hello, I have problems with the navigation path when pressing the TAB key in FORMS 12.
It happens to me in all forms and I have created a test case with the minimum. The test case is a canvas, a window and two blocks.
There are no triggers for anything.
The navigation of each block is in Same Registry mode.
The first block shows a single record, with six keyboard-navigable fields and two non-keyboard-navigable buttons.
The second block shows 10 records with 5 fields each per record. The first field is not keyboard navigable.
If while in the first block I press ENTER, everything goes correctly,