I assume you mean rotor not drum .. double check that you replaced back the pad springs. you will notice holes on top of the pads themselves . Two springs per Caliper ... those little buggers help to push the pads off the rotor...local auto parts stores carry them if you are missing them. Did you make sure there is no air in the lines after bleeding them ? check your fluid level.
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THEN the pins are for the second GEN pilots ..double check you caliper make sure the slide pins are moving.https://www.piloteers.org/members/tahoefever.199546/report
I google my vehicle and its exactly the way I changed the pads and it does not mention those clips. Could it be that my vehicle year does not take those clips?
Hope everything is OK been there myself ...Sorry, I was busy with the wife she had surgery a few days ago. Tomorrow I will definitely open the bleeder on the jammed caliper to see what happens then post it. I'm hoping I can get to the bottom of what's happening before taking it to a shop $$$$$$$.