After the gffread format conversion, the coordinates have negative values

[JWJ13164328557]

gffread -T P.gene.final.gff3 -o P.gtf

chr1 maker transcript -2147273186 -2147256831 . + . transcript_id "Pt1G73530.1"; gene_id "Pt1G73530"
chr1 maker exon -2147273186 -2147272752 . + . transcript_id "Pt1G73530.1"; gene_id "Pt1G73530";
chr1 maker exon -2147266012 -2147265838 . + . transcript_id "Pt1G73530.1"; gene_id "Pt1G73530";
chr1 maker exon -2147265619 -2147265512 . + . transcript_id "Pt1G73530.1"; gene_id "Pt1G73530";
chr1 maker exon -2147265366 -2147265311 . + . transcript_id "Pt1G73530.1"; gene_id "Pt1G73530";
chr1 maker exon -2147265119 -2147265036 . + . transcript_id "Pt1G73530.1"; gene_id "Pt1G73530";