Huge subtitles VOBSUB

I have this problem with Infuse on Apple TV, that movies / series with VOBSUB have extreme HUGE subtitle letters. A normal 2 line subtitle tekst, fills up 3/4 of the screen from the bottom, leaving only 1/4 without subtitle. Have anyone any experience with this and perhaps a suggestions to solve it?

Is this happening with all your files, or just a few?

Which titles are you seeing it on?

The whole series of Friends (2004) (haven’t checked ALL episodes though, but a lot). It’s not happening when I watch Friends series from blu-ray disks.