When mine does that, the grass is very tall and I'm going too fast for it.
I wished the blades were 1/2" longer, and yes mine,like yours 47" old deere deck cuts better ------
with that said,
With the deck flipped over, turn the blades carefully to see if the tips all line up end to end to see if they are all the same height. if not adjust with washers under the blades to even up.
Then see if the blades are inline to each other to check if one or more hubs is cocked on the deck.
Then with the deck back up side, remove cover and look to see if the pulleys are tight on the shaft/hubs and see that the idler and spring is doing it's job and not frozen up, it's also a good time to lube the idler pulley with a syringe filled with grease injected under the seal giving it additional years of use.
Just this past week I had a pulley come loose from it's "staked hub" so one spindle/blade was not turning, rare but it does happen.
Also it is not uncommon for a fellow to make a goof and install one or more blades upside down---- happens more than you think
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