A significant change in workout timing will have an impact on lots of things, many of which will negatively impact the first few workouts until your body starts to adjust
What temperature is your house normally at when you ride indoors?
There’s a bunch of variables you’ve changed all at once
I think the likely culprit is the temperature since it is almost certainly cooler in your house at 7 AM than it is in the later afternoon. If you want to truly try to isolate the problem try changing one thing at a time and see where you end up.