UFC 331 has two lines worth checking: Van vs Pantoja 2 and Tsarukyan vs Ruffy....

https://damiensniceword.readspirex.com/posts/what-does-it-mean-when-a-line-moves-but-it-doesn-t-prove-anything

UFC 331 has two lines worth checking: Van vs Pantoja 2 and Tsarukyan vs Ruffy. One book may have Van -120, another -135. We compare prices across the card, including Tsarukyan at -325 and Ruffy at +280, so you can see where the number still makes sense.