Swelling of Tomato paste
I bought half carton of Tasty Tom tomato paste from Nigeria and recently found out that some of them were swelling up
Outside United States food safety
"When in doubt, throw it out" is the basic food safety rule we're all taught in cooking/food safety or preservation classes.
Swollen cans indicate that the contents have spoiled. I would also be suspicious of the other cans in the carton, since they are likely from the same batch.
Hopefully you can return them and get a refund.