I have finished this a few minutes after Zachattack308, but what I have written does add some information.
Michael is correct. We guess that there was not supposed to be back-to-back NELs but when Uchenna/Joyce fell way behind as a result of their Frankfurt incident delaying their arrival in Kuala Lumpur, the next episode in Hong Kong became NEL and the one after in Macau was probably already scheduled to be NEL.
However, that was not the only instance of back-to-back NELs. In AR3, ep. 8 in Grindelwald finished at Chalet Arnika with a close footrace. John Vito and Jill were non-eliminated, then in Ep. 9 at the boat on Lake Geneva at Montreux Zach and Flo were non-eliminated.
Another instance was is AR5 where Kami and Karli were non-eliminated in ep. 8 at a Bedouin camp near Dubai. In ep. 9 Brandon and Nichol refused head-shaving and arrived last to the Calcutta Victoria Memorial but were saved by non-elimination.
Zachattack308, your information about AR8 is not correct. Ep. 10a was the beginning of a TBC, not a NEL. The legs where there was no elimination were 5, 7 and 9. No back-to-back for AR8.