You imagine 50% profit increase as a big number but that might just be from 2% to 3%. Or from 0.2% to 0.3%. This number by itself is meaningless.

That is a perfectly valid move in a market economy: prices should be expected to be at the point of maximum profitability. You say that they raised prices for no reason other than to make more profit, but that would imply that before the raise the prices were below the point of maximum profitability, which I find hard to believe. It is more likely that the prices changed exactly because the point of maximum profitability shifted, and that can't just happen for no reason at all, and neither can it happen just because the company really wants it to happen. There must be some objective factors behind it.

I'd guess it's likely that the production costs rose. For example: