Welcome to the community Jay!
Definitely something to be cautious of as that is in fact the expected behavior when upgrading multi-seat licenses into a single-seat licenses. When doing so, it's best to contact our License Assistance Team and ask that the either split your multi-seat license, or combine the single-seat licenses into a multi-seat license.
With that being said, I've just reversed the previous upgrade, split the 2011 seats into 4 separate licenses, and upgraded the AutoCAD Revit Architecture Suite 2011 seat to the previously allocated Building Design Suite Premium 2014 license. I'll send you the other relevant license info via DM shortly.
Here to help if additional clarification is needed, otherwise please accept as a solution so that others can benefit from this information!