That’s right – an adjourned meeting isn’t a new meeting, it’s a continuation of the one that was adjourned.
The law is that where proxies are required to be lodged before the time of a meeting, further proxies can’t be lodged after an adjournment of the meeting and prior to the adjourned meeting. (this is settled law) Any proxies put in after the adjournment are not valid.
So you either turn up at the adjourned meeting and vote, or nothing.