I haven't touched Cloud in a.. well, it's been a while, so take me with a grain of salt, but if it hasn't forked that much it sounds that you may have a workflow post-function setting resolution on the issue when it's created.
Can you check the workflow in use by the Epic issuetype and look on the create, is there any post-function setting resolution?
@Radek Dostál hit one thing it could be.
The other one is that the resolution field might be on the "create issue" screen, or possibly the edit screen too.
The field is only intended to be edited/set in transitions into "done"/"closed", and hence is coded to always be selected and filled when on an edit screen. Put it on the create screen, and your users will (inadvertently) create resolved issues, because they can't blank it out.
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