In daily chess you are allowed to analyse the position with a chess set or the self analysis board provided right here on chess.com in the daily games. You are of course not allowed to use an engine or ask for help from another person. But you are allowed to use books and watch youtube videos etc.
So basically, if you are not using the resources allowed in daily, that might explain some of it.
Also because the self analysis is allowed and there is no clock, patience in searching for good moves makes a huge difference.
If you play daily like rapid or blitz (moving too fast), it will probably not get you a very high rating.
I'm a comfortable 1700 on rapid, yet on daily I struggle at 1350.
My rating not been below 1400 in 20 years. Not until I played Daily.
It makes me wonder which rating is the more reliable one, and how much help the opponent is getting in daily.
Also FYI I usually play 20 games at the same time on daily, because I am too impatient.