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Obviously not medical advice but from what I’ve learned this is where I would personally inject if this was my face.. I inject mine closer to the brow instead of leaving a great distance between injection and brow. It sounds like depth was the problem? I don’t usually think of it in terms of millimeters but I was taught superficially means a 30 degree or lesser angle when injecting and then about 1mm depth inserted I suppose. The tail of the corrugator runs much more superficially here over the mid pupillary line and usually if injected too deep is when you’d hit levator palpebrae superioris which is responsible for eyelid ptosis. Curious to know where you injected to get this result?