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I'm designing a FOSS Indic font and have run into some problems. My font works almost as expected, except that when ligatures formed by GSUB rules combine with certain marks, they break down. One example is feature blwf { # Below-base Forms script orya; # Oriya sub or_halant or_ta by or_ta_phalaa; }blwf feature pres { # Pre-base Substitutions script orya; # Oriya sub or_ta' or_ta_phalaa by or_ta.pres }pres feature blws { # Below-base Substitutions script orya; # Oriya sub or_ta.pres or_ta_phalaa by or_t_ta }pres So when I want the glyph "or_t_ta" it forms fine. But when I combine it with "or_reph" or "or_ikaar" marks, the 2nd or 3rd substitution (pres or blws) is ignored and I get "or_ta + or_ta_phalaa + or_ikaar". (ତ୍ତ is the ligature. ର୍ତ୍ତ or ତ୍ତି breaks down). To simplify further it is like this c b -> d b' d -> b.pres b.pres d -> e Gives b+c+b -> e b+c+b+f -> b d f Any ideas why this might be happening? If you want to take a look at my ttf file, I've attached it and it's also on github https://github.com/coldbreeze16/Lekhani/blob/master/Lekhani.ttf I'm a student with limited means, but I'll recompense you for your time if price is right. Lekhani.ttf