Why connect to chromecast instead of rasplex

Hi, got something weird... I found out lately that when i use on my pc google's chrome, and i go to my plex server via its local ip adres, and when i want to cast music, movies whatever to my rasplex, it comes up with a screen that i didn't get before, it asks me to chromecast. I do not have a chromecast, and picking the public ip adres of my server is not going to direct my media to my private networkcable attached raspberry pi.
Where did this occur, i do not know, but only the Chrome version does this, Microsoft's Edge gives me the options i need, rasplex and my phone.
How can i resolve this weird thing from chrome!