Thank you for the quick reply.
I have the latest version of the safari, but I found a solution for my problem. Yesterday I tried to create two columns (1/2 and 1/2) and it was not in a single row in Safari (and everything looked good in Chrome).
Today I created a new contact form with two columns, but I used the size five (5/12ths) for each of the columns. Additionally for the first column I gave offset one (1/12th). Now the form looks perfect in Safari and Chrome ?? Thank you again for this amazing plugin!
Lukas