text field editor error – help!

Hi,

Every time I try to edit a text field I get something like this https://postimg.org/image/r0xio72jb Any edits in the content of text fields completely mess the site up ??

Normally it looked like this: https://s16.postimg.org/qjzhso245/2014_08_29_13_18_57_Edit_Page_Photography_by_T.jpg Without any html tags, css etc

When I go to text editor I can’t see the content. The theme uses WPBakery Visual Composer. So far everything worked fine. Now you can see it only when selecting the text. The visual editor has all of the html tags (I guess they shouldn’t display there). See a print screen: https://s15.postimg.org/atzg9d2fv/image.jpg

Looks really messy – any ideas what can be the source of problem? Where can I look for solutions?

I haven’t updated text fields in about 6 months so it’s hard to remember what other changes/updates did I make during that time ??