16th offline tournament “The Great Miner” on the map “Knotwork”.

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My Dwarves have never stood a chance against Storm... Is it just a coincidence?

Definitely. Dwarves + Storm or Armageddon is a well-known combination, well described by VDV_forever in the Handbook. The question is, is the chance of survival really 25%? While playing in a tournament, I started to doubt it. Dwarves survived only once out of 10-15 attempts. However, I carefully rechecked everything and made sure that indeed, Dwarves can deflect mass spells in 25% of cases. And the streak of bad luck, when Dwarves stubbornly don't want to survive, is just a quirk of the still not fully understood random number generator.

Added 2 hours 56 minutes ago
I will quote the Handbook:

A Dwarf has the best life points, defense, and attack stats at level 2. Only speed is lacking, which limits their use. Dwarves are the only Sorceress units that have low speed. Magic resistance is a unique ability; with a 25% chance (see section 7.3), they can "deflect" any magic directed against them, including combat magic used by the hero under whose command they stand. The best use is to protect Druids and Elves. One of the common tactics with Dwarves is to eliminate a large number of enemy monsters, having the combat spells "Storm" or "Armageddon" in your arsenal.

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16th offline tournament “The Great Miner” on the map “Knotwork”.