Issue in unite funtion

[Anjaligarg006]

I am trying the unite large samples after filtering its seem fine, but after unite chromosome and strand column are showing meta character instead of name chr start end strand coverage1 numCs1 numTs1 coverage2 3500000 \037 384725 384725 15 14 1 14 3500001 - 387067 387067 21 13 8 17 3500002 # 389072 389072 18 12 6 11 3500003 \b 391998 391998 22 21 1 27 3500004 + 391999 391999 \b 26 25 1 18 3500005 , 394729 394729 31 19 12 22