waves GTR plugin noisy when recorded

Hi’ all

Been playing around with Waves GTR.
When I record “wet” effects like tremolo, chorus and “muted for the fishes” etc , it sounds ok when recording
but when listening to the recorded, it very noisy.How come?
I’m using a Focusrite with buffer 2 ms.
Have tried highest size,it did not help. Vst performance meter does’nt show any issue. Average is 15 and peak 5-10
Problem occurs even if I only record 3 tracks for 20 seconds.
I know I can freeze the track but it should not be nessesary in such small projects, I think.