This can happen when the app conflicts with your theme's code or with another app. We'll be glad to check everything and make sure the app works properly on your store.
In the meantime, turn the term off in the app Dashboard so your buttons work normally. Then grant us access to your store admin: send a staff invitation to support@nexusmedia-ua.com and let us know once it's done. If you have a limited number of staff accounts, we can send you a collaborator request instead.
