Thanks Gas Yakker and Thinwater skinner,
It was the local dealer who did the path in the first place!
I spoke to one of the Hobie in-country support reps and he gave the following options:
1. Run a bead of glue around the patch and let dry for 12 hours.
2. If it still leaks, deflate the kayak and heat the area with a hair dryer to loosen the patch. Clean the area with acetone and fit new patch.
Luckily, Option 1 seemed to do the trick, at least for the time being.
Has anyone tried the hair dryer?