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Is it because the securities are trading ex entitlement?

That is XE will first display for a security from the morning of the Ex Entitlement date (generally four business days before the record date) and remains until the close of business on application's close date. Trading in securities displaying XE on ASX Trade does not carry the right to securities in the entitlement issue.

All orders are purged at the end of the trading day prior to the security being quoted on an XE basis.