ORIGINAL: RoswellGrey
Actually, I used to have the reverse problem on my 70. Whenever there was freezing rain (and I'm originally from Iowa, so I've seen plenty of that), both doors would stick shut. If it had rained enough, you couldn't budge either of them, unless there happened to be a water hose nearby that could be used to melt the ice. And then as soon as that water froze, the doors would stick shut again. I broke one of the door handles off one time while trying to get the driver's door open.
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You sure you didn't have the "Dukes" option were the factory simply welded the doors shut...it was usually only found on 1969 Chargers painted Orange, but a few Challengers may have left the factory with this little known option......
(This option also helped during street racing as it made it almost impossible to get your doors blown off)