I need help with code in C# and C++ 🙏

Hello everyone. I am a newbie and I have a question on changing the memory of any game. Kind coders, please help me as a beginner. In C#, I want to write a function "Infinite HP + One Shot Kill". In the nuget for memory editing I use  "Memory.dll.x64"

Here's a script from the Cheat Engine:

[ENABLE]

//code from here to '[DISABLE]' will be used to enable the cheat

alloc(newmem,2048,"GameAssembly.dll"+13AC7CF) 

label(returnhere)

label(originalcode)

label(exit)

newmem:

cmp [rbx+40],0 <-- enemy

jne originalcode

mov [rbx+18],0 <-- me

jmp exit

originalcode:

mov [rbx+18],(float)9999 <-- me

exit:

jmp returnhere

"GameAssembly.dll"+13AC7CF:

jmp newmem

returnhere:

[DISABLE]

//code from here till the end of the code will be used to disable the cheat

dealloc(newmem)

"GameAssembly.dll"+13AC7CF:

movss [rbx+18],xmm0

//Alt: db F3 0F 11 43 18

When I use the script in the Cheat Engine the bytes: F3 0F 11 43 18 change to this value: E9 2C 38 C4 FE and it works fine.

In C#, I write the code:

                // Infinite HP + One Shot Kill

                if (Button1.Checked)

                {

                    n.WriteMemory("GameAssembly.dll+13AC7CF", "bytes", "E9 2C 38 C4 FE");

                }

                else

                {

                    n.WriteMemory("GameAssembly.dll+13AC7CF", "bytes", "F3 0F 11 43 18");

                }

But after I turn on the cheat, created in C#, the game crashes. And it happens in any game in which I do the same thing. But if I change these bytes F3 0F 11 43 18 to 90 90 90 90 90 then the game will not crash. But the function won't work well, not like in the cheat engine. I've tried to change different values from "float" to "int" but it didn't work. The game keeps crashing. What am I doing wrong? Help me, please. 😢🙏