If there is a date gap between these two dates, then you owe Uncle Sam money
The only way he would owe the government money in this situation is if the Ex-Wife was his ONLY dependent; he would likely owe the BAH: DIFF (DAH W - BAH W/O = BAH DIFF) and NOT a full month's BAH.
However, since the SM intimates he has children (who are likely registered in DEERS), those dependents could be used to justify the BAH W rate he received between marriages.
With all that being said... follow HARDCORPS advice and take all your paperwork in to get the situation TOTALLY straightened out. And in the future ensure you (and your Soldiers) do everything the right way, and take care of yourself.
A side note and semi-rant: It pains me to see SM's go through this when the answer seemed so obvious at the time. Laziness from those doing your BAH paperwork and updating your info could cause you money; however, your OWN laziness is at fault here too... if you would have insisted the paperwork be updated properly months ago, there wouldn’t be this issue today. Take care of yourself, its your career don’t let othesr run it...
And as soon as you figure out the right thing to do, ensure those in your CoC/NCO Support Channel know what right looks like, teach your subordinates (if you don’t have any teach your peers) and learn a valuable lesson which will limit stressors in the future.
NCO's Lead The Way!
SFC Nick Martinez
B Co, 3rd MI BN (AE)
Camp Humphreys, KOR
“I am the punishment of God... If you had not committed great sins, God would not have sent a punishment like me upon you.” ― Genghis Khan