Just using the standard Edit function. Some times I can sort of "brute force" the post into shape by double line spacing lists which will sometimes separate the list items correctly (single line spaced, which is how I originally formatted the post). When I've had paragraphs run together, sometimes adding spaces after the last word works to induce the break.
It's odd and just kind of strange that it suddenly started occurring.
Oh forgot to mention, I post exclusively from my phone using the mobile site.