Just ran into this issue myself on a custom train ability.
Only one unit is in the Ability-Info-Unit list, but it creates two. The in-game tooltip shows double the unit cost as well, so something in the background is definitely saying "this button will make two units". But I'll be damned if I can figure out what.
Is there some other value I'm not aware of that affects the number of units spawned by a train ability?
there are possibly 2 units in the info-unit of your train ability of the structure
and as for the double cost
some units already have a (basic)cost associated with it so all you would need to do is either a) remove the (basic)cost from the unit or b) remove the cost from the ability but leave a info-time if you want a training duration.
Edit:
my mistake i just noticed you already checked the info-unit. perhaps there is a blank entry below the unit. when i converted my map to hots i got the duplicate units and double costs and found double entry in info-units.
So I had a harddrive computer problem short if is everything was wiped bar my backups (thankfully)
However they all have an issue where when I use any of the 4 train unit abilities it creates 2 of each unit for no reason.
Has anyone had this issue before or might be able to explain it.
I'm going to see if remaking the abilities work but it's completely strange.
Also no triggers or effects that might cause these that I can see or have added in.
Images because hell it's strange
Also this happens with all the Train abilities not just this one
Making a completely new ability did not work at all.
New ability works on new map so kinda solved but still very odd.
odd seemed to have copied the text from the previous post.
Issues is back, effects attributes on trained items as well but not normal stats.
Just ran into this issue myself on a custom train ability.
Only one unit is in the Ability-Info-Unit list, but it creates two. The in-game tooltip shows double the unit cost as well, so something in the background is definitely saying "this button will make two units". But I'll be damned if I can figure out what.
Is there some other value I'm not aware of that affects the number of units spawned by a train ability?
if it is what i think it is then....
there are possibly 2 units in the info-unit of your train ability of the structure
and as for the double cost
some units already have a (basic)cost associated with it so all you would need to do is either a) remove the (basic)cost from the unit or b) remove the cost from the ability but leave a info-time if you want a training duration.
Edit:
my mistake i just noticed you already checked the info-unit. perhaps there is a blank entry below the unit. when i converted my map to hots i got the duplicate units and double costs and found double entry in info-units.
You create a new one or dupe an existing one?
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
https://www.sc2mapster.com/forums/resources/tutorials/179654-data-actor-events-message-texture-select-by-id
https://media.forgecdn.net/attachments/187/40/Screenshot2011-04-17_09_16_21.jpg