You were sore/felt worse probably because you hit so many areas at once.
Did you drink water after completing your mobility work?
Stuff could’ve been released from your muscle/tissue which needs to get moved out. Some of this stuff is toxic to the person.
As you are addressing issues you need to respect the added range.
You may just be more aware of where your restrictions are now.
There are no days off with mobility. You may not be addressing the same areas/ aspect each day.
So on the frequency will be where that tissue area is for you.
No, you may feel more because you may be using new muscles to complete some tasks.
It like starting anything its tough at first and becomes just what you do.