Auto approving invoices

Good Morning,

We have recently seen an issue where invoices for a certain employee are auto approving.  We do not want them to auto approve and don't recall making any changes that would've impacted this.  Has anyone seen this before or know where we can look? His expense reports are also submitted by someone else on his behalf.  There have been times recently when he went to go approve his own expense report and that was already completed.

Thanks,

Michele