Not a Doctor, take this for what it’s worth

But my understanding is that, depending on the type of seizure disorder and a whole host of other factors, there’s a lot of things that can potentially trigger seizures

Flashing lights are a classic example, but also smells, temperature, stress, diet, hormones, drug/alcohol use or withdrawal, fever, lack of sleep, etc.

Also you said that you gradually halved your dose since then, that might also be a factor. Lets say you were on 100mg before and 50 now. When your body was acclimated to 100mg, it was probably a bigger shock to your system to go without than it is now that your body is only used to 50, obviously 0 to 100 is a bigger difference than 0 to 50.