Creature regeneration time and place

Recently there is a situation in the realm where I play with my friends which is called "Zion".

What has been happening is that creatures like creepers reappear very quickly, in addition to other creatures like zombies, witches, spiders, etc.

They are even generated within the "houses" or structures that we have generated (character regeneration points), the creepers appear constantly and very close to the characters, which makes it impossible to play normally due to the large number that are generated and in time Unusual fast, in fact the creatures are being generated even when the game is daylight, in the case of the creepers, when they appear suddenly, they explode immediately, destroying what we are managing to build, I am not sure what the anomaly is due to If it is a problem on the server or to which it responds, is that why I would like to know if you can help me correct this situation?