You’re right to call out the inconsistency.

For 2026, Akshaya Tritiya was April 19, 2026, not May 19, 2026. The April 19 date is the correct one for the 2026 observance window. ( timesofindia.indiatimes.com)

In Jain tradition, this day is especially sacred because it commemorates Bhagwan Rishabhanatha’s parana after his long fast. ( en.wikipedia.org)

So the correct date is April 19, 2026.