I've seen this before and it's happened again last month(March). Microsoft have superseded the KB for the patch Tuesday updates with new ones. However, the Lansweeper report doesn't get an update so all of the assets show as out of date.
Is is possible for Lansweeper to keep an eye on this and publish an updated report when Microsoft supersede an update?
For example, last month's KB4540673 has been superseded by KB4541335 & KB4551762.