Problem with rotated highlighted text (editing)

Hi to all,

I have a problem with an edited PDF document : I highlighted lines of text with the "highlight" tool a few weeks ago. Now that I just opened it again, the highlights (only the color, not the text itself) rotated anticlockwise and I can't seem to find a way to turn them back "on" the text. (It's a but difficult to explain, see picture).

I use Adobe Acrobat Pro 10.1.9 on a Windows 7 Enterprise laptop.

Thanks!

Best,

Iloé