Why after I load a script it gets REMOVED?

Scripts are usually designed to do only one task and then exit when they are finished. For example a script to close all open orders would try to close all open orders and once it is done it would exit. (it consists of a start() function to do its work and when this function returns MT4 will remove the script)

Code that is meant to stay on the chart is usually implemented as an Expert Advisor (EA, usually used for auto trading) or an indicator (to calculate and plot lines and other things into the chart).

Thank you

Why does my script after loading successfully, does not execute (eg. print values in my syntax)?

There is probably a problem in the code! Check both the Journal log as well as the Experts log for any error message or warning or any clue as to why.

Also, check your code and its logic to make sure it is working correctly.

#property show_inputs