Using exif with media to extract keyword and store in a vocabulary

My intention is to add the iptc_keywords to a taxonomy. I can do this without problems if I use a node, but in media I can't.

I have read the issue #1055750

I have change the fields of the image type file in media like the image that I have attached. When I upload an image using media, I get something like the second image that I have attached: I can view the rows of the keywords but they are empty, the number of rows are the same as the number of keyword plus one. If I go to the list of terms of the taxonomy the new terms are there but they are not asociated to the image that I have just uploaded.

I have look at the database and there I can find new rows using this "select * from field_data_field_iptc_keywords;"

| entity_type | bundle | deleted | entity_id | revision_id | language | delta | field_iptc_keywords_tid |

| file | image | 0 | 1252 | 1252 | und | 0 | 331 |
| file | image | 0 | 1252 | 1252 | und | 1 | 332 |
| file | image | 0 | 1252 | 1252 | und | 2 | 333 |

I am using Media 7.x-1.2 and Exif 7.x-1.2

Any idea why is happening this?

Thaks a lot!