Average CTR on reports tab different than on overview tab
The CTR that shows at the bottom of my campaigns overview tab is different than when I average the CTR I get if I go to Reports>Device> CTR, then manually calculate the average. Please see the image below (doesn't show my company's CTR, for privacy.)
I'm wondering why this is? All the other stats I've pulled from the Reports tab match the overview report perfectly. I've double and triple checked my date range, calculations, etc. Even closed the browser down and re-opened everything, thinking it was a glitch.
Any insight would be very helpful. Thanks in advance!