Help with my new server

[Mr.Wizard 0]

So i recently purchased my own server and had the default Chernarus map for about a week to make sure i got all the basic settings down. Yesterday my friends and i decided that we wanted to change it to the map Lingor island. When i changed it all the people that joined the server that had played before still have the same gear and spawned in the same spot they would have been on in the chernarus map which sometimes puts them in water. Also vehicles seem to not be working. I thought i unistalled and reinstalled the new map correctly but i guess i was mistaken. I have no idea how to fix the problems. Im wanting to just do a complete server wipe and basically have everybody start fresh on the new map. Any help would be greatly appreciated. Also i hope im posting this in the right spot.