There are TWO fixes to this that you must do.  We cannot fix it because it is a design limitation of our system when adding forums that already exist to a parent category that does not exist. 

1) Click FORUMS from the main nav and do not use MyForums button or MyForums from the nav.  In this case all forums will show correctly

2) If you want to use MyForums you must go to SETTINGS -> Forum Subscriptions  and then add the new parent forum "Pattern Universe - RC Pattern Flying to your MyForum list

If you do not do these then the forum may not show or will not show under the correct parent. They system sees you are subscribed to the old pattern forum but since you are not subscribed to the new parent it does not know where to put it so depending on your forum subscriptions it will stick it somewhere else.

3) Alternatively we could get rid of the parent and make RC Pattern Flying the parent and just put the Classic forum above it.  I still am not sure what the benefit of this recent change it but apparently more people asked for it then those who did not want it (democracy in action).