Row indexing bug?

I think there is bug in the backend editor or somewhere else…

I have 5 rows. Each have content but it is not important.

My problem is the following: when I call the ‘Edit this row’ command of a row (for example the 2nd one) and change its style and save it, the next row will change (for in this example the 3rd one) to the set value. I can see the change in the backend editor as it display the row style above each rows. If I open the setting panel again, it contains my set value.
There is a problem not only with that rows but with all of them.
Changing the row style of a row will change the style of the next row- on this page.
This happens only my front page.

Could you help me please? I use the latest WP. My website is the http://www.floacademy.hu.

Best Regards,
Zsombor