May i know the reason why Pansing keeps swapping issues from Taiwanese to the Japanese version?

Have been following this thread since day 1 of the release. I was actually waiting for the iconic Mini from Taiwan Vol 9 and the distributor made it as a gifts without prior notice. Then the Vol 10 classic Impreza 555 was swapped after that and now it happened again on Vol 24.

As i know, usually overseas distributors only use special models as subscription gifts and would not turn regular issues into exclusive / contest giveaway.