Hi Melissa,
Short path to find how this is setup : identify an MQL lead in the lead database and look at its activity log. Filter on "change data values" and search the exact line where the status was changed to MQL. On the right of the screen you will find the smart campaign that triggered this change. Click the link on the campaign name or go back to the marketing activities and search for that campaign.
Do the same on multiple leads and check that the campaign is always the same, in case this was setup though multiple campaigns. One common mistake is to scatter lead status changes all around the marketing activities. This type of changes should be centralized in the Lifecycle campaigns.
-Greg
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