When the page loads a Service Catalog, the following warning messages appear in the F12 Developer Tool, console tab:
wpf:1 [DOM] Found <number> elements with non-unique id #submit:
wpf:1 [DOM] Found <number> elements with non-unique id #btn_move_all_left
wpf:1 [DOM] Found <number> elements with non-unique id #btn_move_all_right
wpf:1 [DOM] Found <number> elements with non-unique id #btn_move_left
wpf:1 [DOM] Found <number> elements with non-unique id #btn_move_right
Service Catalog 17.4
These are just warnings not errors, Chrome shows these warnings as FYI only and won't have any impact on the functionality of the Service Catalog. They can be safely ignored.