I have noticed that a few notams have radius of x, but for some reason SkyDemon is increasing the radius of the notams and drawing the increased radius on the map. Attached is an example. Could this be fixed please.

Actually there is a rule, which is that authorities publish the Q line such that the entire "real" area of the NOTAM is encompassed within the rounded centre and radius, so that radius will always be rounded up (as long as they're doing their jobs properly).