Smush Conflict with WC Frontend Manager

Using the following plugin along with Smush Pro:
https://wordpress.org/plugins/wc-frontend-manager/

The plugin gives an frontend interface to create a product, as shown in the following screenshot:
http://mall2.sites.moho.tw/wp-content/uploads/sites/45/2018/09/2018-09-01_142644.jpg

The images upload when creating a product via the above frontend appears un-optimized:
http://mall2.sites.moho.tw/wp-content/uploads/sites/45/2018/09/2018-09-01_142718.jpg

The issue only occurs when tested with "Store Vendor" account. When logged in via Superadmin, and try the same steps, the image appears smushed.