You have made two separate chains as I can see. When you go to settings on mobile → Sync → Delete sync chain
Now on laptop go to sync → Delete sync account
After deleting it in laptop
Create new sync chain - Add a Phone/Tablet → Laptop should show a code.
Now on phone go to sync → Scan or enter sync code → Scan qr code on laptop.
I think this should solve the issue.
As for the 23 word issue. I am pretty sure that sync phrase has been 24 words always or atleast for a long time now. Heck, it’s been 25 word actually for a year or two too I guess.