Tapped land error
I have been in several matches where lands that enter the field tapped are then tapped several times. For example, the duel lands that enter tapped and you gain a life. The opponent had an island and the blue/black land that enters tapped and they gain a life, so one available blue mana from the island, other land tapped. Then they summoned three creatures for a total of 3 colorless and 7 blue with one island and a tapped blue/black land that entered tapped and they gained a life. This was on the second turn of the game

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[Deleted User] commented
Are you sure it was the "enters the battlefield tapped unless you control two or more other lands" land and not the "enters the battlefield tapped unless you control two or fewer other lands" land?
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Redneckpanther#50922 commented
I just played another game where the blue/white enters tapped unless you control 2 or more lands entered untapped even though palyer had no other land