Possible Spirit Caught On Camera At Loftus Hall?

Last month in Ireland at Loftus Hall with the UKGH team I took this picture within one of the rooms, and when I came to reviewing the pictures I came across this shadow that looks as though it's sat on the chair,
I got really excited as I couldn't account for anything that could have caused the shadow to be there, so I really would like your opinion, is this a possible spirit or just something else.