Appointment+ is coflicting with one of existing Wordpress plug in Event Organiser.

Appointment+ affects the page display that I have full calendar page from my existing wordpress plugin Event Organiser. If I activate Appointment+, full calendar page from Event Organiser will display first two columns very wide and the rest of 5 columns very narrow. This page will display normal if I deactivate plug in Appointment+. I know it might be some CSS conflicts on table display. But I have spent several hours and still cannot figure out where is the issue. I just bought Appointment+ yesterday. Could you help me look into this?