Er....Rina?

[Undyne the Undying]

I couldn't get a screenshot of this, but I noticed after I completed the quest 'Homeless', when Rina left, she turned blue for a few seconds. I mean that the gray part of her fur had turned blue. I'm not sure yet if the quest is repeatable, but if it is, I'll try it again and if it happens again, I'll be sure to try to screenshot this.

[Foxleap]

Yeah..this bug has been happening for...idk how long but ever since I've been playing (a year)...

Um...it only happens when she receives damage/fights right?

[Undyne the Undying]

No. I had just finished Homeless, as I said. However, I had killed all the monsters around but as Rina left she turned blue. She was by that locked house/dungeon.