The driver rim should protrude evenly all the way around the circumference. Sounds like you RX1's may have taken a shock during transport, or the driver bolt has worked it's way loose for some reason. Was it like that out of the box or has it moved during use?
What you have done is correct by losening the driver bolt from the back, re-aligining the driver (it should self align if you have the speaker on it's back). Otherwise '***' the bolt losely and check the alignment. It won't pull in properly until the bolt is tightened. Do not over tighten the bolt as it could result in damage, but you will know because that will cause serious exersion using an allen key. So, just hand tight will be fine. If the driver is still not lined up, then as one of the other forum member suggests, take it back to the dealer and let them have a look.
We use the bolt through driver technique now on most of our ranges and it's proven to be very reliable. Anyway, hope you can solve it easily and quickly yourself