Cannular semi pro

[Cody s]

I recently got a kegland canner semi pro and really like it. It seemed to can great right out of the box.
I am starting to notice some leaks around the lid in 1 out of 3 cans, they are still carbonated when I open them but I am a little worried about long term storage. This only happens when I can condition, it has not happened when I fill from a keg.

Any ideas? Possibly using too much suger to condition with ?

 

[GBRbrew]

The pressure from conditioning in the cans is splitting the seems, there not designed for that.