Problems with hairpins

Has anyone encountered similar problem with hairpins? This is very strange and extremely annoying.

I often use many hairpins in my arrangements. Editing works fine. But when I close the score and re-open it, nearly ALL hairpins from the score cluster on top of each other on the first page. Well, actually they become stretched from their actual position "backwards" to the first page, thus the elongated hairpins are "everywhere" but are most pronounced on the first page forming thick black clusters. This does not fix itself after following re-openings. What's going on?