SendInBlue custom attributes mapping get’s lost

Hi,

nice plugin! Very helpful. I recently had to implement a sendinblue newsletter registration form with Elementor pro and was very happy to have found this plugin.
But I noticed a problem:

1. The field mapping does work but get’s reseted after a while. I am sorry but I can not give you explicit steps to reproduce. Maybe after the first person has registered? Or if the Elementor page is saved with the mappings and then updated a second time…
The syntoms are that when I test the form a second time all of my custom sendinblue custom attributes are not registered.
I only get them to work when I delete my support id from the settings page, save and put it in again and save again. Please help.