Not a bug.
Sure it is. Since when training JS for forwards increases the IS of your center? This problem has been reported several times already, hopefully it will be resolved soon.
The fact that the center popped is not a bug.
The other problem with forward training may be a bug, I don't know.
NO ONE at this table ordered a rum & Coke 
 Charles: Penn has some good people 
 A CT? Really? 
 Any two will do 
 Any three for me 
 Any four will score 
 Any five are live