There are several on both lists, so there is not a fork, most likely your list is a little old or some of the computers you have are offline.

Yes, still synchronizing, but should only be a little while.

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Before a person invests in a coin they should research the explorer a bit, especially if there has not been an active explorer for a while.

The most important things might be a) Do coins have some reasonable distribution? If one person has all the coins then they can push the price to the moon then dump on newcomers and keep pounding the price down. This is done with coins that have short pow cycles but can also be done with a coin that was sleeping for a while. In this case it may be Cryptopia that has a lot of coins and they have been good so far in aiding distribution. b) If geographic distribution is good then there is some reason to think that the coin appeals to a wider group. That is visible on the geolocation part of the network tab. Not sure other things a person might look for.