quagmire

Hi I have a Connect T200 2006 and have just had the rear lock replaced as it broke. I picked the van up and it wasn't until I got it home that I noticed that when you lock the doors from the key (i don't have a fob) all doors lock and then unlock?! Another strange thing is that the interior light is on. Obviously I can take the van back on Monday, but I want to lock my van up tonight! Any ideas please? Thanks in advance