Hi VGNPWS
I've just checked it and the font is there. If you browse this directory:
/wp-content/plugins/atum-stock-manager-for-woocommerce/vendor/mpdf/mpdf/ttfonts/
You should have the "DejaVuSerifCondensed.ttf" font file.
If you have the file there, one thing that could cause this is another plugin using the same PDF library that we are using (mPDF) and conflicting with our own version. In order to determine this, I'd suggest you disable all your plugins except WooCommerce and ATUM and try again. If it works in this way, you can start enabling them back one by one until you find the conflicting plugin.
Best Regards,
Salva.