Erroneous Spell Modifier - Can't adjust

[WalkinDude]

For some reason, when one my my wizard 5e players copies the cantrip fire bolt or chill touch to their spell book, the game automatically gives them a +12 to their attack roll. I can't alter the figure coded in the box as shown below:

FG Spell Modifier.png

The player should have a +7 added based on their current 19 in INT (+4) and Proficiency Bonus at level 5 (+3), but the game automatically puts in a +12 under this.

Any help would be much appreciated.

[LordEntrails]

Please don't post the exact some post (or even issue) in multiple places.
Closing this thread because there is already discussion here: Erroneous Spell Modifier - Can't adjust (fantasygrounds.com)