I recently encountered a difficulty, there is a set of unstrand data through STAR or hisat2 to get bam file, and then through bedtools bamTobed into bed file, but I found in the bed file in the sixth column (strand column) appeared '+-', unstranded bed file of the sixth column should not be '.' Shouldn't it be .
This is the expected situation：
This is the observed situation：
Thanks in advance for the help!