With 7.x when using autosubmit it is possible that both $el.attr('data-drupal-selector') and $lastTriggeredSelector are undefined. This causes every field where this happens to be autofocused due to the .each() being used to find correct element.
Create view, make it have at least one multivalue exposed filter and enable autosubmit for BEF.
Enable drupal/chosen (4.x) module which modifies the filter to be incompatible with BEF
Now when loading the page, given filter is auto-opened & auto-focused, and re-focused even if you try use some other filter.
At least make sure undefined is not considered as match, but limiting the focus into one element should be considered as well.
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Active
7.0
Code
This prevents the flickering of multiple select filters although might not be the ultimate solution
Issue #3485649 by dropa: Autosubmit focuses fields it shouldn't
Change seems small enough though I don't mind including.