Phase issue when double tracking

Hi everyone. I have a phase issue, can anyone help? I double track my rhythm guitar (two mono separate performances of the same part, with same settings, but different pan). I tried 2 tracks with Plini, 2 tracks with Petrucci, and one track Plini + one track Petrucci ; issue always there. With Petrucci, I played with the phase parameter (IR screen) ; no luck. I tried deactivate all the effects, even EQ and IR, no luck. No other plugin in my tracks. It’s fine if I have only one (instance) track. Focusrite 2i2, Windows 10, Cakewalk, all up to date. (I didn’t had this issue with my free 5150 sim plugin). Any idea? Thanks.