Adding to control group breaks the control group, only new units remain

4 different friends have told me the same thing,

if u add one more unit the the control group, it doesnt work, only new units remain.

take a look, its a very common issue,

Hi! To create control groups, you can use CTRL+1 to create a control group on key 1.
To add units to group 1, you have then to press SHIFT+1. Is this what is not working?

Have a nice day!

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ok i have explained to them that control has been removed from producing that functionality