Note goes flat on Neural plugins when palm muting on 6th string

Hello! When i palm mute on 6th string with soldano slo 100 with overdrive (no pedals) or other neural dps plugin the note goes flat, - 10ct, especially from 8th fret+. If i toggle drive pedal goes fine (but i no like sound). The guitar itself is intonated and in tune, without it or other vst is fine. Any help? This problem is with every guitar i have with the neural dps plugins. Can you help?

Need help please if someone can test this too