HP steam transmitters on 1X1 configuration

Hi all,
I am having difficulty understand the following. When running on 1*1 configuration (one Gt and steamer), I see that my HP steam flow transmitters start acting erractically when raising load. I have two transmitters A and B and both start acting up. My drum level on the HP is fine. You would think that your 3 element control based on steam flow for feedforward would affect your drum level control but it doesn't.
Any ideas on why those transmitters act up ? It is not happening on a 2*1 configuration.
Thank you for your help.
 
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