Hello,
My Raspberry Pi 2 with Libreelec V7.0.1 (Kodi 16.1 Git:c327c53 complied May 17, 2016) displays some wrong black word subttile in white sentence. It happens about one over five string; it means 4 strings are correct and 1 string wrong. The font encoding is arial.ttf with utf-8. The subttile is external .srt
The error does not happen with english subttile.
I have tried a lot of setting in system->video->subttiles and cannot fix the problem.