It seems the fines have to do with voters providing the wrong county of residence when registering through third party canvassing groups, for which, for some reason, the groups are responsible for. Apparently minority groups see particular boosts in registrations by third party groups, so hindering their activities will likely have a disproportionate impact.
I don’t disagree, so here is an article on this by the Guardian
https://www.theguardian.com/us-news/2023/jul/13/florida-fines-voter-registration-groups
It seems the fines have to do with voters providing the wrong county of residence when registering through third party canvassing groups, for which, for some reason, the groups are responsible for. Apparently minority groups see particular boosts in registrations by third party groups, so hindering their activities will likely have a disproportionate impact.