Smaller ports aka Casual Players are the problem.
Larger ports just simply invest in the MEGA IPO and are done.
Smaller ports mostly consist of casual players. Casual players see a MEGA IPO and get attracted to the brand recognition (Avengers; Justice League; Star Wars...) and assume that these brands will make them profits so they blindly invest. Because they are smaller ports they have less cash and they have to liquify their accounts/ dump stocks to free up cash. Smaller ports usually do not have many shorts, their ports are usually filled with longs and those longs are usually the last MEGA brand IPOs that they bought.
Smaller ports will dump stocks to free up cash so they can invest in MEGA IPO. Since MEGA IPOs are priced very high and they are smaller ports, they dump their highest priced stocks, which are usually the brand IPOs that they bought in the past (Avengers; Justice League; Star Wars...). Since smaller ports usually do not have a large amount of shorts, the damage they do to prices is usually the highest priced blockbuster moviestocks that are scheduled to be released a year or more from now.
Smaller ports/ casual players do not read the boards and cannot be reasoned with. We joke on the boards and call them 'sheep' because they move in a flock like motion. They do not spend very much time at HSX. They log in, scan the posted news, buy the linked stocks and log out.
FYI
Smaller ports/ Casual Players were the reason behind making the Hot Actress Starbond Rule. Whenever HSX IPOs a starbond for a very actractive actress, the Casual Players just automatically buy and the IPO always sells out and the price rises (no matter what or how far away the next adjust is).