Mage Blizzard AoE issue

Hiya! I followed the video guide on setting up AoE Blizzard across multiple mages. I managed to get the spell to start casting across all the toons. However, only the current primary window continues to cast until the end. The other mages prematurely stop right after starting the cast. I figured it might be an issue with my mouse so while testing I just used a simple keyboard bind. No dice though, it continues to do the exact same.

Does anyone have any ideas on what could be causing this ? What configs would be helpful for me to post ?

[MiRai]

Does anyone have any ideas on what could be causing this ?

After beginning their cast, I assume those characters are either moving or trying to use another spell that interrupts the channeled spell.

None of the characters are moving and I didn't cast another spell. I only hit the hotkey for blizzard once.

[bob]

The ISBoxer hotkey for this cannot be a mouse button.

Other than that, you can share your config
https://isboxer.com/wiki/Configuration_ ... figuration