Oh, I see what some of the confusion on this wonder was. It occurs twice.
Yes, that is true. Each GW that triggers a GA has two entries. This setting was needed as CCM 3 had not enough free building slots (limitation to 256 buildings in Civ 3) to give each civ its civspecific GW by using a civspecific prerequisite building (mostly flags in CCM 1-2.5). The original building entry in CCM 3 is fixed to the civspecific era-none tech of each civ and therefore cannot appear in the techtrees of the game. Therefore each of those civspecific GWs is connected to a resource or a normal building that is available at a certain tech in the techtree, resulting, that these civspecific GWs can only been built when that resource or building becomes available in the techtree.
To show those civspecific GWs in the techtree when it is the earliest time they can be built, another civilopedia entry is needed. Therefore each of the civspecific entries has an additional "dummy" entry so those civspecific GWs can appear in the proper techboxes of the techtree when their prerequisites are available. These dummy entries use civilopedia unit entries and have a * in front of their names.
Unfortunately I forgot, that the wrong unit costs of those dummy entries can be seen in the entry. So I will fix those costs in the dummy entries to the real costs of those GWs. Thank you all for reminding me to that problem.
In one of the last versions of the C3X mod, Flintlock was able to overcome that 256 building limit, so in the long run CCM 3 can return to the old settings with civspecific buildings (flags) as prerequisites for the civspecific GWs and the dummy solution will no longer be needed - but this will cause an enormous amount of work in the civilopedia that would trigger a severe delay for the next update of CCM 3. So the next update of CCM 3 will still have those dummy entries - but with the fixed costs.
Not sure why it has movement.
Because it is a unit entry and I found no way to delete the automatic unit movement, attack and defend stats only for those dummy entries.