When notes that are entered as seconds are moved to another pitch, they will incorrectly retain the offset spacing generally required for spacing notes that are a second apart and would otherwise collide.
To resolve this, the best thing to do is delete the errant note, and re-enter it. Our developers have been informed of this issue, and the work slated to address this issue is part of an effort to improve Finale's automatic music spacing as a whole.
No timeline is yet available concerning resolution of this issue; however, please click the Follow button at the bottom of this article if you would like to be updated when more information is available.