Segmentation fault (core dumped) and problems of gene orientations

[Cesnl]

When I use the -mix parameter, I consistently encounter an error message that says "Segmentation fault (core dumped)." However, when I run StringTie separately with either short read BAM or long read BAM files, I don't receive any errors. What could be the reason for this? Additionally, I'd like to inquire why the gene orientations represented as '+' and '-' in the output GTF file from StringTie using short read BAM files are completely opposite to those in the reference annotation GTF.

[Cesnl]

Looking forward to your response. Thank you very much.