Hi Adam,
On this ocassion I think it is a foreground star. I’ve found some old images which show the bright star at that position.
http://www.astrocruise.com/galaxies/m108.htm
http://www.astrosurf.com/jwisn/m108.htm
Though this bright star near the centre is not always so obvious as can be seen from Graham Winstanley’s image.
https://britastro.org/node/10192
It might be that it is a variable star, or possibly a very red star that shows up more prominently in some images than others depending on filters and equipment sensitivity. I’ve tried to identify the star to confirm its nature, but no luck.
Good call though as it is always a good idea to check images for the unexpected.
Cheers,
Andy