It seems that this update "hid" any previously created lists that were local to the device.
Here is how to fix your badges.
Open Reminders
In the search box type a single letter - example C
You will see a list of all your reminders, even the hidden ones, that have that letter as the first letter of any of their words.
Any uncompleted ones should be on top.
Either mark them as Completed or if they are still pending, move them to a new list.
You may have to repeat this with several different letters until you find your task(s) that are causing the badge icon to be wrong.