In bullish trends, fluctuations are completely normal, usually due to generational profit-taking. For example, some investors bought an asset at 1 USD, then it rose to 2 USD, that is their target, they sell it to the next generation who buy it at 2 USD, then it rises to 3 USD, and now they sell it to new investors, and so on. It depends on each one's objectives, but many times there is agreement on goals, that is where the price stagnates because often sellers gather and there is a lot of supply, but one must wait for new buyers to emerge. Sometimes, due to oversupply, the price drops a little; no asset rises diagonally in a clean manner.