Question about parameter -uf

[dudududu12138]

Hello, now I have a Nanopore cDNA sequencing data. And I detected the strands of every reads from the raw data. Then I mapped the reads to hg38 with minimap2 -ax splice -uf -t 8 $ref $reads >result.sam. But the strand of some reads are not matched with my detection. For example, this is a read that detected as '-' : @100:1591|SRR25723945.21919894 9167ca31-862e-4ff7-900e-b2e4da99787b length=1668 strand=-. But the mapping result reported it as a '+': So which one should I choose from the 3 sets below? My data is neither a direct RNA nor an unknown strand data.