Assembly coverage calculation is broken

Open chrM contig from MCF7_dir100.bam.

1. Look at assembly-coverage.png. Welcome screen shows 3 million of reads per region, however, there are only 300 000 reads in the whole chromosome.
2. Look at assembly-5000.png. The browser shows coverage 5000 (and the hint shows "row 5000"). It's wrong info for this BAM.