Barcode displaying as blocks instead of barcode

I have been using this package to generate barcodes for various pieces in my application. Yesterday I had to make updates to the linux server that the application is running on now the barcodes come out as blocks instead of like a barcode. I have added photograph to show what I mean. I have not been able to reproduce this issue in my local development.

What it looks like now:

What it used to look like:

该提问来源于开源项目：milon/barcode