smart albums messing my pictures

Hello,

First I ask you to consider that I'm french and my english is far from perfect. Yet, I hope you will understand my problem help me.

I create smarts album the following way :

• I use the item called "description" in french (it is the field just above "keywords" in the informations of the picture, or the third one on the list of choices to make smarts album)
• with conditions like : description includes : <name of someone>, <place of holidays>, <event>

So I can have the pictures of my kids, friends or last holidays... together.

Of course, the same picture can have differents words in his description : a place, one or more names of people, an event, and so on.

Lately I observed many problems :

• the smart album of one friend just empties spontaneously, no more photos in it, and when I look at the informations of pictures where I'm sure that I put his name, the name is no more there ;
• a picture of someone (smart album named "Marie-Jo") that was in the smart album of last year holidays "Aveyron 2016" is no more in it but have moved in the smart album of that year "Alsace2017" holidays, with "Alsace 2017" in its informations ;
• so I changed back and put "Aveyron 2016"like it was before in the description field , and then all the pictures of the smart album "Aveyron 2016" have been included in her smart album, and when I look at those pictures all have "Marie-Jo" in her description ;
• moreover, I have another friend named "Marie-Laure" and she too got all the pictures of "Aveyron 2016" in her smart album because her name have been spontaneously added to the field description.

Now It's all a mess in my pictures.

Of course I used the repair function of Photos, with no results.

Thanks for your help.

Pascal