Line Height problem when converting from epub to pdf

HI

I am converting a lot of epub to pdf (among other things, to take advantage of the highlight feature).

But the conversion process increases the line height so when I select a line and highlight it, the highlight goes over the line above and the line below.

See how the highlights overlap:




Whereas on other pdf, the overlap is almost none existant:



I have tried to change the Line Height, the Minimum line height and the line size (in look and feel) and also the font size, font type but I always get these overlaps.

So which settings should I change so my Pdf highlights doesn't overlap on the lines above and below?