Monzo & DriveNow

Has anybody used their Monzo card with DriveNow?

They don’t accept Monzo cards when you sign-up as it doesn’t have a name on it but you can change it afterwards.

I did this a while ago and they charged me a random amount when I booked a car, which they refunded me a week later. Another time they charged me for a previous trip when I booked a car. Coincidence or have other people noticed this as well?
I don’t use it often enough to test.