Both teams are totally different in recent performance.
Atalanta lost only 1 of the last 7 league games and won three of them heavily.
AS Roma are in gloomy form as they lost 4 of the last 6 rounds.
Even though they are obviously advantagoues in H2H records, AH market changed the line from home team -0/0.5 to -0.50, which is backing Atalanta.
Therefore, we can expect more from the hosts.