thank you for the suggestion. I'll improve my project based on it.
Anyway I could say, based just on my small knowledge, that I didn't see any problem till now on the server.
I don't think anyway that it is related to my problem just because I used the app since two weeks ago and it had no problems about the zoom. It started happening just after I accidentally delete the variant in the designer.
Just a question. Did you have the same zoom issue at your side with my project?