Definitely chain skipping over the sprocket and not indexing of gears or freehub skipping that could be to blame?
I'll check but previously the two cassettes both worked perfectly with the same indexing. That said, I did replace the gear cable recently and reindex so it may be a little out this time and only apparent on one.
@chris0 started
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Definitely chain skipping over the sprocket and not indexing of gears or freehub skipping that could be to blame?