Seats won by NDA+ "POSSIBLY" due to the vote slitting by BSP (as per INC's Logic). Only margin below 10000 are considered,

1. Bachhwara : CPI lost to BJP by 484 votes,

CPI - 53808 - 29.94%
BJP - 54545 - 30.21%
BSP - 1086 - 0.6%

2. Tikari : INC lost to HAM by 2630 votes, when BSP got 7276 votes

HAM - 69750 - 37.69%
INC - 67005 - 36.28%
BSP - 7276 - 3.91%

3. Barachatti : RJD lost to HAM by 6318 votes, when BSP got 9679 votes.
(All main candidates are with Devi surname, is it a Dalit majority area?)

HAM - 72249 - 39.21%
RJD - 65512 - 35.79%
BSP - 9679 - 5.26%

4. Sakra : INC lost to JDU by 1537 votes,

JDU - 67072 - 40.25%
INC - 65330 - 39.33%
BSP - 1917 -1.15%

5. Belhar: INC lost to JDU by 2473 votes,

JDU - 73284 - 40.16%
INC - 70571 - 38.81%
BSP - 6103 - 3.34%

6. Hilsa: RJD lost to JDU by 12 votes, Yes just 12 votes..!!

JDU - 61616 - 37.35%
RJD - 61603 - 37.35%
BSP - 3077 - 1.86%

7. Jhajha: RJD lost to JDU by 1679 votes

JDU - 76595 - 39.55%
RJD - 74816 - 38.69%
BSP - 13416 - 6.93%

8. Bhorey : CPI-ML lost to JDU by 462 votes,
Why congress heartthrob ally Shiv Sena contested against them?

JDU - 73550 - 40.5%
CPI-ML- 72524 - 40.25%
BMP - 1305 - 0.72%
Shiv Sena - 1307 - 0.72%