Oubid myself by increasing max bid

[frumper]

I was winning an auction with a bid of £141, as the auction was ending in the early hours of the morning I increased my Max bid to £150.

The auction immeditely jumped to £150 with no-one else bidding.  I therefore, outbid myself.

How is this possible?  

[plpmr]

a bidder cannot bid against themselves - either there was a reserve or other bidder[s], look at the bidding history including the automatic bids.

[frumper]

There was a reserve. What happens in this situation? If your max bid is over the reserve does it jump straight to the reserve amount??

[plpmr]

yes, your bid jumps to the reserve and won't go any higher unless another bidder bids above you.