Simba's passive, Strength of the Ancestors, gives him 2% bonus defense (4% at lvl 2) per 1% missing health. So assuming a Simba with his passive at lvl 2 and less than 10% health, he could have over 360% bonus defense.
It's impossible to know without you giving more details, like the Simba's current health, any buffs he may have had or any debuffs Fred may have had, but it's likely that it was not a bug.
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It's impossible to know without you giving more details, like the Simba's current health, any buffs he may have had or any debuffs Fred may have had, but it's likely that it was not a bug.