Older polls are not displayed in 4.7.x

When I clic the "more" link in the poll bloc, I can't see some polls.

For example, this is a old poll, node #43 : http://www.salsamontreal.com/montrealsalsa/danser_avec_une_belle_personn...

But when going here : http://www.salsamontreal.com/montrealsalsa/poll
... I can't see it.

In the database (dump), this is a recent poll that I see :
(1194,'poll','Quel est la première raison pour laquelle vous sortez dans un endroit, plutôt qu\'un autre, pour danser?',1,1,1159102566,1159206328,2,1,0,0,1194)

This is an old one that I can't see, witch is the node #43 up here :
(43,'poll','Danser avec une belle personne sans talent ou une personne d\'apparence ordinaire qui danse bien?',1,1,1064113457,1127271921,1,0,0,0,43)

Is there a fix limit of the number of polls in the "more polls" link? Or, is there another problem?