What determines whether Destiny enemies are vulnerable or resistant to a particular damage type?

This page lists the enemy shield types that are vulnerable to different damage types. When I was playing recently, I noticed that a particular shielded enemy was resistant to Solar damage. Are enemy shields that are vulnerable to one type of damage resistant to another type of damage?

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Does Damage type matter in Destiny 2?

Doesn't matter.

What are the destiny elements?

Elemental types

Kinetic\u2014White\u2014the default damage type on most weapons. Will cause basic damage to any enemy.
Solar\u2014Orange\u2014causes Solar damage.
Arc\u2014Blue\u2014causes Arc damage.
Void\u2014Purple\u2014causes Void damage.
Stasis\u2014Indigo\u2014causes Stasis damage.

What is the most common damage type in Destiny 2?

Kinetic - This is white and is the default for the majority of weapons in Destiny 2. It has no bonus damage to any enemy.

Destiny Beta: Elemental Weapon Damage (Solar, Arc, Void) Explained

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Khaled Akacha, Roger Johansen, Andrea Piacquadio, Photography Maghradze PH