Hi RayKi! Thanks for your collaboration! ^^
The object leaves from an one frame animation to a real "5 looped frames" animation long after the scale effect has been executed.
I put the scale effect in a group, that is activated at the start of layout. Then the effect isn't under the condition "Every tick".
Group Scale
Object: Set Size
lerp(Object.Width,194,1.5*dt)
lerp(Object.Height, 331,1.5*dt)
Addendum: Even maintaining the object actual size with a boolean instance variable before the animation execution, the problem continues.