Hi Paul,
Of course I’d like for you to choose OpenEars, but I understand if this bug is a decision factor for you right now since it can only be investigated and fixed in the time available.
Number acquisition with a complex grammar is a somewhat difficult question across all speech solutions (you might see this when Googling it here and at Stack Overflow). But based on your description, it might not be the ideal case for a grammar if the ability to repeat is central to the vocabulary’s utility. Have you tried it as a language model instead of a grammar?