When there is a merge in git the comment mentions the branch name. Bamboo would then show it on its dashboard like this

Code Changes
	somebody
Merge branch 'IB-12.34.567' of http://someurl/repos/somerepo into IB-12.34.567

If the branch name seems to follow a jira key pattern bamboo wrongly identifies it as a jira ticket, setting the underlink, trying to communicate with jira looking for details on this in-existing ticket, etc. In the case above bamboo would identify IB-12 as a jira ticket.

Bamboo should be able to let configure which strings patterns are not to be taken as jira tickets.