[tijl]

That's not really what voter research shows. Yes, 18% of BBB voters come from the PVV, but also 17% come from the Prime minister's party (VVD), 14% comes from his Christian-democratic coalition partner (CDA). 9% Comes from the left-wing SP, 7% from D66. The amounts coming from other parties are even smaller https://app.nos.nl/nieuws/ps2023/

[ZeroGravitas]

The seats lost/gained are:

BBB +139

FvD -71

VVD -16

CDA -30

So, the voting system has lots of parties and ranked voting but it seems clear that the main story is FvD lost out to BBB.

https://en.wikipedia.org/wiki/2023_Dutch_provincial_election...

[t0mas88]

You forgot FvD which was the big winner 4 years ago, now loosing their seats to BBB.