WiFi issue, taking laptop home, wifi doesn't work on return to work

Recently redid the network of one of the schools i work for.

Re-subnetted, re-vlan'd, changed wifi passwords.

All teachers are on laptops (HP ProBook 640 G2). A couple of them take them home at night, and when they come back in the morning, in order to get on wifi they have to forget the network and rejoin.

I've updated drivers, i've wiped all wifi networks from the laptop i've been using to troubleshoot. I can't replicate the problem while onsite.

My laptop (a Dell), has no issues swapping between the 5 schools that are all setup nearly identical, the only differences being SSIDs and IP Schemes. 3 of the 4 other schools are also using the same laptops, and also I am not hearing any issues there.

It feels like it may be their home network scheme is messing something up when they report to work?

Aruba APs, HP Switches, Fortinet Firewall managing DHCP. No servers.