To be honest, I have no idea why one guy had his Sony TV set add those channels 30 minutes after autoscanning. They weren't there when he autoscanned, they appeared later, and they were bad channels just like you are experiencing.
His issue was similar, it would select the wrong channel each time he wanted to watch channel 7.
All I can really do is pass on my experiences to you, and see if removing the odd channels fixes your problem. I went back to this customer 3 times, replaced his main board, once and even the brand new board added those channels. He had a very good aerial with a power amp on it, and we tried a different amp too. Neither worked. I called Sony about this issue and the engineers looked into it. They suspected a "multipath interference issue" which basically is nothing more than the original signal path was being bounced back to his aerial in his specific area.
Note that ALL Kalamazoo customers didn't have this problem, only he did. The last thing we tried on the 3rd visit was to simply erase these false channels from his channel guide manually, and that's the last time he ever called us.
I asked my office to call him back about the results...I never got those results.
But when a problem is fixed...most people don't call back. So I can only assume he never had a problem afterwards.
Like I said, I can pass on my experiences and have you try them out, see if there is a restoration of normal operation. Only you can verify it works or didn't work.
Sometimes there really isn't an answer...just educated guesses.