Update issue / margins errors

Hello, I’ve red many messages of people posting their update issues and the way they solved, but I could not find an answer for me.

In my case, form inputs appear marginless, so every input is completely attached to the next. I’ve another issue with margins of small text in a contact label.

I can’t solve by modifying the CSS because the edit has no effect: in other words, I can’t force the margins to behave differently.