steps to reproduce:
1) search some issues to do a bulk change to
2) open another browser tab and search some other issues ... just because a collegue called in and wanted some answers
3) go back to the first list an click bulk change
4) -> the bulk change will be applied to the second search list (last one executed) instead of the one displayed on the same page

This should at least be caught to issue a warning to the user.

There might be a nicer behaviour in such circumstances like: reexecuting the search with the filter settings of that 'page', if the search list displayed isn't the same as the last on executed, might be nice.