The King James Version of the Bible, translated in 1611, or more than 2,000 years after Leviticus was penned (the documentary hypothesis guesses at around 500 BCE), is what's usually used by those claiming the Bible condemns homosexuality. Let's look at their translations:

18:22 - Thou shalt not lie with mankind, as with womankind: it is abomination.

20:13 - If a man also lie with mankind, as he lieth with a woman, both of them have committed an abomination: they shall surely be put to death; their blood shall be upon them.

Things aren't quite so clear when we use the Intralinear Hebrew-English translation. It captures the ambiguities without the biases of the translator:

18:22 - And with male you shall not lie down beds of woman, it (is) abhorrence

20:13 - And man who is lying down with male beds of woman, the two of them they did abhorrence, they shall be put to death, the bloods of them in them

Certainly a bit more ambiguous, but that's to be expected when you're translating from ancient Biblical Hebrew. And, besides, Biblical scholars, both religious and secular, have long acknowledged that many parts of the Bible are ambiguous and where interpretation isn't necessarily clear. This might very well be a good example, but given the emphasis they're given to justify hatred towards gay people, it's worth the effort to analyze them more deeply.