Mansfield toilet incomplete flush

I just had an issue with my Mansfield flush valve being too hard to flush, it felt like the handle would break. I replaced the gasket at the bottom of the plunger and that fixed that issue, but the toilet now only lets out about 25% of the water before it closes. Any ideas on what could be causing that? I noticed that there is another gasket at the top of the plunger, does that now need to be replaced?
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