As an aside to the obvious fact that you aren’t going down, I’d be seriously concerned about an odds checking site that consistently gets the best price wrong if I was using it to gamble.
You’re not, Bet365 are offering 1000/1 on palace going down, Ladbrokes and Corals are offering 500/1.
In comparison all three of those betting sites are offering 20/1 on Brighton going down.
I’ve never even heard of SportPesa...