I CREATED A NEW ACCOUNT TO HELP YOU.
I encountered the same problem (every album was duplicate.
I disabled Photos app (phone was brand new) and before enabling it I encountered another problem (I don't remember it now but I did web search and cleared cache and data of each app including system apps because phone was new).
I realized later that Photos app is disabled, I enabled it again. Clones were gone.
Updated the app and it worked fine for a month.
2:00am here and I was searching for the solution of clone albums again.
Yes! But this time only one album was cloned by PHOTOS app (not all).
I see that it is GOOGLE photos, so you won't find solutions on google and instead you'll find unnecessary links like if you're the only person having this issue which is not true.
These clone albums have no thumbnail, pics and videos inside them seems blank and instead of opening om touch they seem to LOADING or BUFFERING or STREAMING idk why.
IDK what came in my mind that I went to
-Apps and info (oreo)
-Media Storage (this is the system app)
So I started to search for a solution again. I came to your thread and went back sad. I opened the photos app amd suddenly albums started to disappear (I was scared as I thought my photos are getting deleted). Album were shuffling like playing cards and I went to see the duplicate album, it had disappeared already. Shuffling stopped, no clones.
IT ACTUALLY WORKED BUT RESULTS CAME A BIT LATE SO I THOUGHT IT DIDN'T WORK INITIALLY.
So, that media storage app data clearance thing actually had worked but results came a bit late (5 minutes) and I DID NOT RESTART MY DEVICE.
Now go back and see the first sentence that I wrote in BOLD in this reply.
Since I cleared data of all apps, it also included media storage app, I guess only this app is the culprit and only this is the ACTUAL SOLUTION.