What should you do if you don't know the wig file is based on GRCH37 or GRCH38?
One possible way is to change it to bigwig. chr9 in GRCH37 is shorter than GRCH38 while chr18 is longer than GRCH38. Usually it should work to identify the genomic reference version.
http://hgdownload-test.cse.ucsc.edu/goldenPath/hg38/bigZips/hg38.chrom.sizes
http://hgdownload-test.cse.ucsc.edu/goldenPath/hg19/bigZips/hg19.chrom.sizes
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