SMAA signed by non-committee member

Hello,

I have recently joined a strata committee in NSW where no one was appointed as Chair, secretary or treasurer formally at the AGM. At the same AGM, we renewed the strata management agreement but it was signed by a husband and wife team who are not on the committee and own the same apartment complex. The husband attended part of the meeting but his wife was not present at all. My questions here are

1) Can this contract be voided based on the fact that no one from the committee signed the contract? My understanding is that it should be signed by the chair and secretary only. The agency agreement also has a clause that states that if these roles aren’t filled then the strata manager can perform these roles.

2) Does this constitute a breach of the strata manager’s responsibilities?

Thanks