Congrats. Yes I've seen this. They do happen on several IGT, not just on 5 scatter triggers, but they are RARE!
This is what is great about IGT slots, the creeping multipliers that retrigger. That's a lot of retriggers you got for Cleopatra.
These caps are from the best one I've had on an IGT slot, not on Cleopatra but on Bitten.
It retriggered three times, adding ten free spins each time, so the multiplier crept up to 40x
Most of the hits were minor, but the best ones were a 4 scatters on the 26x multiplier and a scatter/wild on the 39th spin.
Ended up paying 327 pounds. (I was staking either 26 pence or 39 pence, playing 13 lines).
ps. The screencaps are rubbish as the video I took cuts off half of the multiplier/bonus figures at the bottom,
I used a video capture that you have to set the window manually and I was a bit too excited to be accurate
but you can get the gist. Also I've editted my name off the top of the caps, as BetVictor likes to stick your name on the slot for some reason.