I had upgraded my RB1200 to 5.18, all works ok; ether1 is ether1 and so on.
Today I decide to reset the router and reconfigure it again, strange things happen to me: ether1 via winbox is ether 10 on the chassis and so on, they are all inverted. 
Any one had the same problem?
I use it for pppoe purpose like main router with about 20Mb of traffic and not more than 100 user; pool had more than 200 ips but nothing more than 9 users logged??? very strange.
Any help?
Thank you