In the first movie Alan gets sucked into the game in 1969. When he, Sarah, Judy and Peter beat the game in 1995 time resets to 1969. Fast forward to 1995 Alan and Sarah meet Judy and Peter but obviously they have no memory of their adventure as technically it didn't happen at least not in their time line.
But in Jumanji 2 Alex is sucked into the game in 1996 and returns back then when the game is beat. But the rest of the gang who enter in 2017 return to 2017 with full memory of what happened in the game and of their old time line, but are totally unaware of the changes that happened due to Alex returning 20 years prior.
Is there a reason why this didn't resolve like before? (Other than the fact Spencer, Fridge, Bethany and Martha would have forgotten all the valuable life lessons on the way)
And as Alex knew how dangerous the game was why would he donate it to the school so some other poor kid might get trapped for 20 years.
PS can someone edit in the spoiler tags can't see how to do it on the mobile site