My question is about casualties at the Battle of the Seelow Heights. In 1945 the German defenses were effectively collapsing with Hitler throwing the kitchen sink at the Soviets and hoping for the best.

At the heights the Soviets outnumbered the Germans 10:1 based on Wikipedia. Veteran Soviet shock armies faced off against understrength ragtag German units... And the Soviets suffered 30k dead to the Germans 12k?

I understand they were defending, but these are heavy tank armies vs whatever Hitler had left.

How could Soviet casualties be so high? Are these number just wrong, were casualties assessed differently on different sides? What is going on here? Particularly since these lopsided casualties seem common in eastern front battles ie Battle of Narva 68k German casualties vs 480k Soviets?