Movement Bug w/ Tudor Tileset

We built a base out of the Tudor tileset at the start and as of this morning I'm having terrible movement glitching through a specific room. My camera will judder and my avatar will move in a random direction, even after I stop pressing WASD. This is semi-reproducable in this part of the house, but there's nothing around that area but support pillars. May be relevant: I have a movement+ build and my movement speed is 25.7%.

Please help; this game already gives me so much nausea and this is pushing it into unplayable territory for me =(