Rotobrush propagation doesn't allow me to change my rotoscopy

Hi, recently I had one pretty weird issue which consists in endless rotobsuh render, and due o this I can't change anything even though I have aready unfreeze my rotobrush. Whenever I choose some frame from the propagated range, it starts propagate my clip fom initial point and normally as i know after effects allows you to work with your rotoscopy adjusting frames that have been already propagated. Also I need o mention that when i press ctrl+arrow it doesn't start doing this and I can edit my frames, but as you understand it is awful working that way. So, I hope I'm not the one who had this prblem before. Thanks