[MarketPress eCommerce] MarketPress Store not retaining items in cart

MarketPress Store not retaining items in cart. Screenshots:
https://www.dropbox.com/s/boq7gcnq1ymxvdi/Screenshot%202018-04-23%2014.59.48.png?dl=0
https://www.dropbox.com/s/gsacttfav4exjz6/Screenshot%202018-04-23%2015.00.15.png?dl=0
https://www.dropbox.com/s/0k146d93z7p6bww/Screenshot%202018-04-23%2015.00.25.png?dl=0
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Please let me know if you need WordPress credentials to troubleshoot.
Thanks.