Is my shed haunted...........?

Okay, so me and 3 of my friends and my brother were all investigating around my shed and my radar said there was a really strong ghost presence in there so we went to investigate. We got to the shed and about 2 minutes after we went in there, my camera (which had a full battery) just DIED. It has NEVER done this before and my brother got kind of freaked out. Then we all took 3 minute turns inside the shed alone and with the doors locked. Then at the end, we would all share what happened to us. We ALL got a ladder tilting/sliding and a sled moving. Then my emf detector got this HUGE spike. Keep in mind that there is NO electricity or anything that could of caused that spike in my shed. Then, the creepiest thing that made 3 out of the 5 people that were there just RUN away. We were all in the shed together and then we heard a very clear "hello", then after that, the ladder that was on the OTHER SIDE OF THE SHED just FELL. The creepy part was the fact that the ladder was strapped down and had BAGS of soil keeping it down. There is absolutely NO REASON for it to fall. The only logical explanation I can think of is that there was someone else in the shed and the undid all the straps and then moved the bags and then THREW the ladder over. But when we aimed the camera there, there was NO ONE there. And we couldn't of gotten to the ladder because there was a TON of stuff in our way and blocking it. And we were ALL standing still when it happened, sure, my shed is small, but its the fact that the ladder was STRAPPED down and blocked by the soil bags. Sorry im writing so much but there was so much stuff that just DOESN'T MAKE SINCE!!! The only people who didn't run from that were me and my friend Zach. Then to top it all off, we got an EVP that said "Successfully burned lincoln chamber". I don't know what that means but nothing strange in our house has ever happened because our house is kind of new. But i do know that the shed was there before the house and has always had an eerie type of feeling. I'm almost sure that the shed is about 60 years old. And about 2 blocks from where I live, there is the factory that produced some of the guns for the battle at Gettysburg. I don't know how much that relates to the EVP that we captured, but I do know that it is a creepy coincidence.