Reply To: Can't set discount as percent, edit filter date = Nan.Nan.Nan

4. If you take a look at the source code of the select you see how html is getting formated wrong. This way the browser reads it as text instead of options.
This isn’t caused by easyreservations, would try first to switch to standard theme to see if it’s your theme.
Else deactivate other plugins after another to find the problem.