Does my apartment have a ghost or spirit?

Hello everyone,

So I have just got a new apartment and haven't even fully moved into it yet, still staying at my old place until this week. Anyway two days ago I stepped onto my balcony to wave to my mum then came in, locked the door and left the house to meet my mum. When we came back I noticed the back door wide open, I asked if my mum had opened it and she said she hadn't, it was already open when we came in. I know I locked it but shrugged it off saying maybe I didn't.

When we left the house I locked the door and just before we stepped outside my mum went and checked it and it was indeed locked; however when we got on the bus which passes the back of the house my mum said my back door was open again! I reminded her I locked it and she checked it and she said she must have saw wrong then and it must have been the apartment above.

When I got there this morning the back door was indeed open! At the moment I'm still going back and forth with suit cases of my stuff so I walked over to the door and pushed it fully open and kind of refused to acknowledge it. I unpacked my stuff and went to the back door and went to close it when I realised the opened door was locked! I had to unlock the open door so the handle would come down so I can close the door and lock it again.

There is no way the door could have locked itself again! I was scared so got out as quick as I could.

When I accepted the property I was told an old woman lived there, my mum asked if he was going to say she died but he was adamant she didn't die she just moved further away. We had no reason not to believe him however over the past few days her letters have still been coming through, letters from the government but if she had moved she legally would of had to change her address. Also there was letters to a mr..... With the same surname but we was told she lived alone.

The back door does look a bit off so I will ask for that to be fixed and would also ask what really happened to the previous owner. I will also speak with the neighbor.

What do you think is going on here? When you walk in you don't feel any negative energy or presence but then you also don't feel any other energy. It's like it's neutral.

Will or can this thing harm me? Is there anything I can do to the house? I have thought about blessing it but haven't got a clue how to and I don't believe in God, I'm more a spiritual person.

What am I up against here? Or is it simply just a broken door that somehow stayed locked although it was open?

Oh I must say the keys have always been in the door, when I first came they were in there and iv just left them in there to make it easier.

I get the electric and gas put on tomorrow and will also buy my appliances tomorrow too so I can start living in there on either monday or tuesday.