Press This on Multisite

I am running a multisite hosting. All sites use the Press This function however one site has an error. When working from a desktop Press This thinks it is on a mobile and therefore displays the mobile interface which doesn’t work on a desktop as all the interactions need to be initiated by touch. How do I correct this to display the desktop version of the Press this interface? Have cleared cache, still same problem. All other sites work fine it is only this one site. All sites use the same theme.