I’ve encountered some extremely weird behaviour in a font and even after looking at the font features in FontLab can't for the life of me figure out what's going on. I was wondering if anyone could explain this to me.
The font in question is the version of Dalton Maag’s Aller Light which is available from TypeKit (or Adobe Fonts as it is now called).
The light upright weight of this font contains small capitals as well as a number of ligatures not present in the other weights. However, there are no smcp/c2sc features and the ligatures aren't included in the liga feature.
One can add these glyphs using InDesign's glyph palette, but then all hell breaks loose. Many of the glyphs start acting as if they had large negative kerning pairs (which they don't) as well as vertical repositioning rules. sometimes they show up stacked above the previous glyph, sometimes they overlap it, sometimes they appear normally.
If anyone with a creative cloud subscription is willing to take a look at this and try to figure out what's happening, I'd be rather interested. I don't actually need the font for anything. This is just curiosity about what could cause such weird behaviour A few other Dalton Maag fonts in TypeKit also seem to contain alternates which aren't mapped to by any opentype feature and which behave in deranged ways).
I can't open the font in DTL OTMaster since that doesn't have an 'open installed font' option like FontLab and since its a TypeKit font I don't have the actual file.