It is intentional, because both players ranked 1st. Splitting the points might be OK for YOUR formula, but might not for others. Probably splitting the combined points for 1st and 2nd place (assuming we have a 2-way chop) would be most appropriate, but again, not necessarily.
To work around this, you can set the rank of each player involved in a chop. For example, if in heads-up and one player has 10K chips while the other has 5K chips, they might decide to chop, but obviously not an even chop. So you divide the winnings appropriately. Likewise, the person with 10K chips would likely still be ranked 1st, while the other person ranked 2nd.
You can also adjust each player's points manually, but you probably knew this already.