That is strange.
In the suppliers list, is there an amount showing under the 'Accounts Payable' column against the suppliers account?
Try this instead:
Click 'Purchases' tab
In the left hand column under 'Accounts Payable' choose 'View Accounts Payable'.
From this pane, select the dates, and supplier from the drop-down menu - hopefully that will show some meaningful information.
Unfortunately, Express Accounts can be very frustrating. An alternative, if it becomes problematical might, be Gnucash, which is well supported, open source and hence free, which I use, you can view it here https://www.gnucash.org/.