Thanks for the report. It's very possible it's an issue with the game input. Is there a specific line/scene that it consistently happens in? And are you using mouse, keyboard, or controller input?
I only recently started the game over on 4.8 but so far the scenes that I remember it happening on was the player's dialogue on responding to Rickon's demand of paying him, then when giving Drackey the player's name and when checking the object that Rickon dropped. At first I thought it might have been from me holding down the mouse button to skip the dialogue I've already read but then it skipped again when asking Corsica why she was sitting at the same table in the restaurant and I wasn't holding down the button to skip through beforehand. I mostly just use the mouse but I did test using the spacebar and it still did skip. Testing it again (at least on 4.8) so far it seems to mostly happen to the dialogue box after being given a choice to make. However, I remember when playing on 4.7 during the time when the player helps to look for Corsica's lost ring a dialogue box skipped when we were in the apartment with Corsica's roommate (I forgot her name) and I think it skipped at just a random interval but it could have skipped after being given the choice at the roommate's laptop, I can't remember when.