it is because is used centering for DVB subtitles which are generated as left aligned subtitles and provider has wrong generated first and second rows into first and second region - second row is generated partialy into first row. Because you using "black transparency" to No (it seems) and subtitle are centered, then this rest of second row is moved with first region. In your case it seems, is not cleared second region, when is broadcasted only first row.
Set black transparency to Full or do not center DVB subtitles.
Better is use yellow with full transparency. Subtitles are better visible and must not be used black outline.
There in PLi E2 is partilaly this rests removed, but when it is not almighty. May be, broadcasted subtitles are biger than usualy.
I think, somewhere I have modification, when user can choose line, where is cleared... I will see if this could help... which service ?
Edited by ims, 11 December 2014 - 12:13.