Perhaps a previous owner thought they'd switch to long drive shafts, but just did the one side first to see how it felt. As their daily commute was always round an anti-clockwise one-way system it handled just fine.
If it's any consolation, a previous owner of my donor had fitted a copper brake pipe into a union feeding a rear drum without flaring it. Thankfully it let go while I was bleeding the brakes, not out on the road. Needless to say I stripped the entire braking system down and made sure everything was safe.
It looks like you'll need to fit another long shaft to get the clearance you need, but aren't the radius arms for long and short shafts also different lengths and/or the ends sit at different angles?
Anyway, a thorough check of all the suspension and braking components appears to be in order.