Braces for 5 years so far; is this bleeding normal?

Hi, i got my braces back in 2011 and have had so much done and gone through so many orthodontists at my local surgery (i haven't moved). Im on my 4th orthodontist who is finally doing things right and is having to correct the wrongs done by all the past ones. I had my braces tightened and brackets redone today and the gum between my two front teeth is bleeding. I had a 80mm over jet and have had 2 premolars removed a year ago. Is this bleeding normal? In UK

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