If your K-1 "looks right" but your tax liability under the trust doubled then we are either both missing something or you are not interpreting what you are seeing correctly.
Unfortunately, I cannot see your return which makes it difficult (if not impossible) to troubleshoot effectively.
I will suggest that you enter Forms Mode and carefully review your 1041 and your K-1.
Frankly, if you are entering the data correctly, you should not be seeing a correct K-1 (for your scenario) coupled with tax liability for the trust.
