Cannot enter correct stock transaction in GnuCash

[Scott Simpson]

GnuCash 2.2.4

I'm trying to enter a stock transaction in a stock account in GnuCash.
The amount of the buy is $461.88 and the price is $122.02 (which comes
out to approximately 3.7853 shares). Whenever I enter the price of
$122.02 and the shares as 3.7852811 it shortens the shares to 3.7853
and changes the price to $122.019 and make a new row with a tenth of a
cent. How do I stop it from doing this? Thank you.