The primary and secondary stress markers in IPA output are placed in a wrong manner. They should be before the syllable start rather before the vowel. Note that some of the IPA output can be processed by IPA syllabification scripts (such as https://github.com/codyrobbins/syllabify\), which should be quite trivial to port. But to use them, one would also need to distinguish tied glyphs (i.e., distinguish between /t͡ʃ/ and /tʃ/, cf. nutch and nutshell). Adding those should be easy enough, though this is maybe a feature request. But the stress marker thing is a bug.