Listing Custom Field "Array" Error After Upgrading to 6.5.8

Under Listing Setup, I have a custom field “Payment Method” which should allow 5-7 checkbox options (i.e. Paypal, Check, ACH, etc.).

After upgrading to 6.5.8, I receive a “Array” error and the text is now formatted as a URL link. It should instead look like “Paypal;ACH,Check”.

Check out the error below the breadcrumb on this page. Also, see the “Payment Method” field on the “Details” tab:
https://affiliatelister.com/directory/adsuit-affiliate-program/

Error:
Warning: strpos() expects parameter 1 to be string, array given in /home2/cecomp/public_html/affiliatelister.com/wp-content/themes/DT/framework/class/class_shortcodes.php on line 1578