Why is editor running all my text together in visual mode?

I have a Job Listings plugin.

It apparently is not the plugin.

Can someone please assist in working out why, when I enter all the text in lines, as soon as I save a draft it runs all the text together and EVERY TIME I access the page I have to (laboriously) redo it again, only to have to save it and the text goes back to being all run together.

It is doing my head in and I don't have time (or expertise) to work out what is going wrong.

The developer of the plug in says it is something to do with Editor, but why when it all used to work fine????

Thanks.

Karen

I have a screenshot to add but will have to post this before I can add it it seems.

I will open access for someone to check it out. Thanks.