Classical rating too high?

I've been focusing on playing classical recently as I want to improve and have read that slower time controls are good for this.

In blitz and rapid I'm between 1000-1200 but after 4 games of classical(3 wins & 1 loss), I have a provisional rating of 1923 with a rating deviation of 179.17.

Just find it really strange that there's such a difference between ratings. I haven't played rapid in a long time but have played blitz quite a bit.

I imagine my classical rating will probably drop a fair bit over the few games.

I suppose I'm wondering whether there's some kind of inflation with classical ratings?