[SOLVED, due misclosed custom HTML] Backend editing TABs of item form are missing

Here is what i get:

Also this picture

Hello

- the HTML syntax is broken either misclosed quotes or miclosed tags

are there any quotes in article type name ? or in any of the other TAB titles
e.g. you made a language override of some of the string of the TAB titles ?

Hello

it can be an update field that is adding misclosed HTML tags
or maybe you added custom HTML via the field:
Tabs / Fieldsets / Custom HTML ?

if you have the above field then temporarily unpublish all field of the type

Prefix - Suffix - Separator in field "prawa00"
Every value prefix : <div>
when I clear this tabs display OK.

Hello

Every value prefix : <div>
when I clear this tabs display OK.

The above explains it, openning a <div> and then not closing it , is like a car with a wheel missing from one side, it will not function properly

- just remember to always close custom HTML tags that you open
e.g. in your case you need to also add </div> to the every value suffix, so that it gets closed

Thanks for feedback, it confirms that there is no bug

Regards