E-Mails Adress in Contact will not be saved

Hello, i have a question.

In my standard Contact Layout i have the ability to use 2 email adresses

But when i put in a email adress in the first email field it will not be Saved.

Only when i use the second email field it will be saved.
Even when i deleted the second email adress fields, the data in the first field are not saved.

Is this a bug or feature?

SuiteCRM Version 7.8.15
Sugar Version 6.5.25 (Erstellen 344)