Oracle 12.2c rman can't catalog second backup piece

I'm using  Oracle 12.2.01   . I do rman backup with  MAXPIECESIZE 15 G ( any size) .

But when I re-catalog  backup piece I  many second backup piece can't catalog .

rman display 

List of Files Unknown to the Database

=====================================

File Name: /bk_pure/rman/new.1/bk_3_1btf5vpb_3_1.bak

File Name: /bk_pure/rman/new.1/bk_3_1ctf5vpb_3_1.bak

File Name: /bk_pure/rman/new.1/bk_3_1dtf5vpb_3_1.bak

File Name: /bk_pure/rman/new.1/bk_3_1etf5vpb_3_1.bak

File Name: /bk_pure/rman/new.1/bk_3_1ftf5vpc_2_1.bak

File Name: /bk_pure/rman/new.1/bk_3_1ftf5vpc_3_1.bak

File Name: /bk_pure/rman/new.1/bk_3_1gtf5vpc_3_1.bak