It occured to me that you might have had what I had a bit ago. Are you sure the juice isn't leaking out of the ribs when you foil them up? I had that happen last time on a rack. Had to double wrap. <To be fair I'm pretty darn done with foiling all together. it's alot of work and I don't see much benefit>
Lost my juices one time, about 7 years ago.
Ever since that I put them in a foil pan & cover that with foil for Step #2.
Then I just remove the foil for Step #3.
Bones can't poke a hole in the Foil pan like they can through Double wrapped foil.
Bear