Liftover fails for several regions

[Emma]

Hi! Why is this liftover failing? Is there a workaround? I'm mapping from hg38 to hg19. 

Thank you!

#Split in new
chr1 145686997 148411223
#Split in new
chr1 145686997 148411223
#Split in new
chr1 145808272 148411223
#Split in new
chr1 145808272 148411223
#Split in new
chr10 46005406 49845537
#Split in new
chr10 46005406 49845537
#Split in new
chr15 22782170 28134728
#Split in new
chr15 22782170 28134728
#Split in new
chr15 22782170 30076787
#Split in new
chr15 22782170 30076787
#Split in new
chr15 22782170 32153204
#Split in new
chr15 22782170 32153204
#Split in new
chr15 82534140 85169770
#Split in new
chr15 82534140 85169770
#Split in new
chrX 48447780 52444264
#Split in new
chrX 48447780 52444264

[Emma]

If I set Minimum ratio of bases that must remap: 0.9, then I'm able to liftover several of them. However, 3 remain:

#Split in new
chr1	145686997	148411223
#Split in new
chr1	145808272	148411223
#Split in new
chr10	46005406	49845537

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