Hmm that planer is able to handle that cut. It may be that someone ran some sappy wood through after I used it last week and the rollers need to be cleaned. I sprayed Glidecote, which helps a lot. Otherwise, it’s hard to diagnose not seeing it happen but a few thoughts off the top of my head:
Were the boards long and fed without infeed roller support? That’s pretty heavy stock and so I wonder if they were levering up into the top assembly, which could make it more difficult for the rollers to feed.
I assume the reference faces were jointed first. It could potentially get stuck if the top side being planed has an inconsistent thickness (ie, parts of the board are thicker than the leading edge) as that could lead to a much deeper cut than expected. I typically run a ghost pass first to knock off any high spots.
I can take a quick look before my mentor series class tomorrow evening.