Memory Bloat while using THP

When I use the transparent huge page(THP) I found the progress will become memory bloat. the memory will increase with a fixed interval time. Once I closed the feature of the THP, the memory of the progress did not increase any more.

the OS is Red Hat Enterprise Linux release 8.10 (Ootpa). the version of the libevent is libevent-2.1.8-5.el8.x86_64.

Could tell me why it become memory bloat. And if you are best, Could you tell me how to resolve the problem besides closing the feature of the THP.

THP enabled

THP disabled

thank you very much.