I would like to know why the description of the step file is changed

I open and use the step file exported from eyeshot. The exported step file seems to change the property information as shown below.

Example:

 FILE_DESCRIPTION(('STEP AP214'),'1');
 ->    FILE_DESCRIPTION(('STEP AP203'),'2;1');

The reason I inquired about the above problem is that the specific functions that use the file became slower as the step file was changed.