This is not a bug in Dragon. Servers “speak” encryption via ciphers. Each server and client can communication on different ciphers all depending on what they agree on. Comodo.com and the Forums have different ciphers enabled on them, thus the differences. Since the Forums hit a 128-bit cipher first, they agreed on the 128-bit.
Since Comodo and Dragon agreed on the 168-bit (higher grade cipher), it was used.