There are spad signals on the network but they are supposed to have 3 aspects that flash red when you pass the corrisponding signal. I didn't think there were any on the Isle of White. In any case if this was a legitimate spad signal it should be blank in this situation.
For some reason the SPAD indicators on Isle of Wight are indeed wrong. Not quite sure what Rivet did here but for example the signal coming into Sandown from Brading should not have the SPAD plate.